Arencibia-Jorge, Ricardo, Leydesdorff, Loet, Chinchilla-Rodriguez, Zaida, Rousseau, Ronald, Paris, Soren W.
The current communication presents a simple exercise with the aim of solving a singular problem: the retrieval of extremely large amounts of items in the Web of Science interface. As it is known, Web...
Four alternatives to the journal Impact Factor (IF) indicator are compared to find out their similarities. Together with the IF, the SCImago Journal Rank indicator (SJR), the EigenfactorTM score, the...
Evaluating Environmental and Resource Economics Journals: A TOP-Curve Approach (2009)
Rousseau, Sandra, Verbeke, Tom, Rousseau, Ronald
This article applies an alternative approach to the measurement of scholarly quality, namely the use of TOP-curves, in order to rank journals in the field of environmental and resource economics....
Abstract Duality in information retrieval and the hypergeometric distribution (2008)
Duality is an important topic in informetrics, especially in connection with the classical informetric laws. Yet, this concept is less studied in information retrieval. It deals with the unification...
The Editorial and Advisory Board and the Publishers of Scientometrics are glad (2008)
Loet Leydesdorff, Ronald Rousseau, Ronald Rousseau
to announce that the 2003 Derek John de Solla Price Medal has been awarded to
The Fussler Sampling Technique (2008)
This article discusses a sampling technique suggested by Fussler and further described by Bookstein. We show that Fussier’s method, which takes into account that books vary in thickness, is always...
Claude Shannon: scientist-engineer (2008)
Claude Shannon, Ronald Rousseau
In this article we present an overview of the life and work of Claude Shannon, who died begin 2001. Shannon is a pioneer in many fields of science. He introduced Boolean algebra in switching theory,...
Evelien Otte, Ronald Rousseau, Evelien Otte
The effect of postings information on searching behaviour Social network analysis: a powerful strategy, also for the information sciences
Convexity issues and the Yule-Simpson paradox (2008)
Suzy Ramanana-rahary, Michel Zitt, Ronald Rousseau
Aggregation properties of relative impact and other classical indicators:
This is a preprint of an article accepted for publication in JASIST © 2006 TOP-curves (2008)
Leo Egghe, Ronald Rousseau, Sandra Rousseau
Several characteristics of classical Lorenz curves make them unsuitable for the study of a group of top-performers. TOP-curves, defined as a kind of mirror image of TIP-curves used in poverty...
Determining the core of a field's literature. i.e. its 'most important ' sources, has been and still is an important problem in bibliomehics. In this article an exact definition of a...
Some ideas concerning the Semantic Web Abstract (2008)
Brendan Rousseau, Ronald Rousseau
In 1998 the World-Wide Web Consortium (W3C) inaugurated a research initiative centred on the idea of providing semantics for and facilitating the extraction of knowledge from the WWW. The Semantic...
ABSTRACT TOPOLOGICAL ASPECTS OF INFORMATION RETRIEVAL (2008)
Let (DS, QS, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following Everett and Cater,...
When studying numerical properties of a population (technically: a conglomerate) it often happens that not all data are known. It might be that the total number of objects (persons) in the population...
Power laws, such as Zipf s law, and exponential relations, leading to straight lines in logarithmic or semi-logarithmic scales, are presented in a unified setting. It is shown that the class of...
Q-measures for binary divided networks were introduced in 2004. These measures can value the status of notes as linkage (or bridges) between two groups in a connected undirected network. We collected...
An h-index weighted by citation impact (2008)
An h-type index is proposed which depends on the obtained citations of articles belonging to the h-core. This weighted h-index, denoted as h., is presented in a continuous setting and in a discrete...
On indexing in the Web of Science and predicting journal impact factor (2008)
Wu, Xiu-fang, Fu, Qiang, Rousseau, Ronald
We discuss what document types account for the calculation of the journal impact factor (JIF) as published in the Journal Citation Reports (JCR). Based on a brief review of articles discussing how to...
The h-index of a conglomerate (2008)
Rousseau, Ronald, Guns, Raf, Liu, Yuxian
The h-index of a conglomerate is defined. It is further shown how Prathap’s h-indices can be presented in a conglomerate framework. An example illustrates the use of the conglomerate framework.
Dust storms are remarkable natural phenomena. They affect many countries in the Northern Hemisphere and, as such, have become an interesting research topic. We show that nowadays China is the number...
On indexing in the Web of Science and predicting journal impact factor (2008)
Wu, Xiu-fang, Fu, Qiang, Rousseau, Ronald
We discuss what document types account for the calculation of the journal impact factor (JIF) as published in the Journal Citation Reports (JCR). Based on a brief review of articles discussing how to...
The h-index of a conglomerate (2008)
Rousseau, Ronald, Guns, Raf, Liu, Yuxian
The h-index of a conglomerate is defined. It is further shown how Prathap’s h-indices can be presented in a conglomerate framework. An example illustrates the use of the conglomerate framework.
Dust storms are remarkable natural phenomena. They affect many countries in the Northern Hemisphere and, as such, have become an interesting research topic. We show that nowadays China is the number...
Janssens, Annika, Rousseau, Ronald, Coudeville, Pol, Scherpereel, Luc, Vandegehuchte, Patrick, Vanden Abeele, Luc, ...
Escher Staircases on the World Wide Web (2007)
Ronald Rousseau, Mike Thelwall
It is shown that Escher Staircases, i.e. cycles of four nodes in a graph with reciprocal links, form a basic structural element on the World Wide Web.
An h-index weighted by citation impact (2007)
An h-type index is proposed which depends on the obtained citations of articles belonging to the h-core. This weighted h-index, denoted as hw, is presented in a continuous setting and in a discrete...
The Role of Ethnic Ties in International Collaboration: the Overseas Chinese Phenomenon (2007)
Jin, Bihui, Rousseau, Ronald, Suttmeier, Richard P., Cao, Cong
The term ‘Overseas Chinese Phenomenon’ is used here to refer to the fact that scientists of Chinese descent play an important role in international collaboration between mainland China and the...
An h-index weighted by citation impact (2007)
An h-type index is proposed which depends on the obtained citations of articles belonging to the h-core. This weighted h-index, denoted as hw, is presented in a continuous setting and in a discrete...
The R- and AR-indices: Complementing the h-index (2007)
Jin, Bihui, Liang, Liming, Rousseau, Ronald, EGGHE, Leo
Based on the foundation laid by the h-index we introduce and study the R- and AR-indices. These new indices eliminate some of the disadvantages of the h-index, especially when they are used in...
The pure h-index: calculating an author’s h-index by taking co-authors into account (2007)
Wan, Jin-kun, Hua, Ping-huan, Rousseau, Ronald
We introduce a new Hirsch-type index for a scientist. This so-called pure h-index takes the actual number of co-authors, and the scientist’s relative position in the byline into account. The...
On EGGHE's construction of Lorenz curves (2007)
Contrary to Burrell's statements, EGGHE's theory of continuous concentration does include the construction of a standard Lorenz curve.
An h-index weighted by citation impact (2007)
An h-type index is proposed which depends on the obtained citations of articles belonging to the h-core. This weighted h-index, denoted as hw, is presented in a continuous setting and in a discrete...
The R- and AR-indices: Complementing the h-index (2007)
Jin, Bihui, Liang, Liming, ROUSSEAU, Ronald, EGGHE, Leo
Based on the foundation laid by the h-index we introduce and study the R- and AR-indices. These new indices eliminate some of the disadvantages of the h-index, especially when they are used in...
On EGGHE's construction of Lorenz curves (2007)
Contrary to Burrell's statements, EGGHE's theory of continuous concentration does include the construction of a standard Lorenz curve.
The Role of Ethnic Ties in International Collaboration: the Overseas Chinese Phenomenon (2007)
Jin, Bihui, Rousseau, Ronald, Suttmeier, Richard P., Cao, Cong
The term ‘Overseas Chinese Phenomenon’ is used here to refer to the fact that scientists of Chinese descent play an important role in international collaboration between mainland China and the...
The pure h-index: calculating an author’s h-index by taking co-authors into account (2007)
Wan, Jin-kun, Hua, Ping-huan, Rousseau, Ronald
We introduce a new Hirsch-type index for a scientist. This so-called pure h-index takes the actual number of co-authors, and the scientist’s relative position in the byline into account. The...
EGGHE, Leo, ROUSSEAU, Ronald, Rousseau, Sandra
Several characteristics of classical Lorenz curves make them unsuitable for the study of a group of top-performers. TOP-curves, defined as a kind of mirror image of TIP-curves used in poverty...
A case study : evolution of JASIS' Hirsch index (2006)
The evolution of the Hirsch index of the Journal of the American Society of Information Science over the period 1991-2000 is studied using a variable citation window. A relative h-index is introduced.
Simple models and the corresponding h- and g-index (2006)
The relation between the Hirsch index and Egghe’s g-index is determined for some simple models such as the uniform model, the point model, the linear model and Zipf’s model.
Thoughts about the Stacey & Stacey measures for the logical quality of web searches (2006)
The Stacey & Stacey formula for the quality of AND web queries is analyzed and explained, leading to a proposal for a simplified alternative. Examples clarify the procedure.
An informetric model for the Hirsch-index (2006)
The h-index (or Hirsch-index) was defined by Hirsch in 2005 as the number h such that, for a general group of papers, h papers received at least h citations while the other papers received no more...
Simple models and the corresponding h- and g-index (2006)
The relation between the Hirsch index and Egghe’s g-index is determined for some simple models such as the uniform model, the point model, the linear model and Zipf’s model.
New developments related to the Hirsch index (2006)
It is shown that the h-index on the one hand, and the A- and g-indices on the other, measure different things. The A-index, however, seems overly sensitive to one extremely highly cited article. For...
Rousseau, Ronald, Rousseau, Sandra
Several characteristics of classical Lorenz curves make them unsuitable for the study of a group of top-performers. TOP-curves, defined as a kind of mirror image of TIP-curves used in poverty...
An informetric model for the Hirsch-index (2006)
The h-index (or Hirsch-index) was defined by Hirsch in 2005 as the number h such that, for a general group of papers, h papers received at least h citations while the other papers received no more...
Simple models and the corresponding h- and g-index (2006)
The relation between the Hirsch index and Egghe’s g-index is determined for some simple models such as the uniform model, the point model, the linear model and Zipf’s model.
Rousseau, Ronald, Rousseau, Sandra
Several characteristics of classical Lorenz curves make them unsuitable for the study of a group of top-performers. TOP-curves, defined as a kind of mirror image of TIP-curves used in poverty...
Systems without low-productive sources (2006)
Information production processes (IPPs) without low-productive sources are studied. A success-breeds-success or preferential attachment mechanism is established in which, from some point in time on,...
Remarks concerning the Liberman-Wolf bonding number (2006)
ROUSSEAU, Ronald, Rousseau, Sandra
The Liberman-Wolf bonding number can not be considered as an acceptable measure for the internal bonding of a research group or community. This is shown by a construction where adding the same number...
Reflections on the age distribution of Japanese scientists (2006)
Asonuma, Akihiro, Fang, Yong, ROUSSEAU, Ronald
The age distribution of a country's scientists is an important element in the study of its research capacity. In this article we investigate the age distribution of Japanese scientists in order to...
An informetric model for the Hirsch-index (2006)
The h-index (or Hirsch-index) was defined by Hirsch in 2005 as the number h such that, for a general group of papers, h papers received at least h citations while the other papers received no more...
Simple models and the corresponding h- and g-index (2006)
The relation between the Hirsch index and Egghe’s g-index is determined for some simple models such as the uniform model, the point model, the linear model and Zipf’s model.
Systems without low-productive sources (2006)
Information production processes (IPPs) without low-productive sources are studied. A success-breeds-success or preferential attachment mechanism is established in which, from some point in time on,...
Jin, BH, Sun, XX, ROUSSEAU, Ronald
Chinese science has developed rapidly over the latest fifteen years. It is said that it is now in a quantitative expansion phase. A series of programmes extending over a period of twenty years has...
Classical information retrieval and overlap measures such as the Jaccard index, the Dice coefficient and Salton's cosine measure can be characterized by Lorenz curves. This result demonstrates the...
Remarks concerning the Liberman-Wolf bonding number (2006)
ROUSSEAU, Ronald, Rousseau, Sandra
The Liberman-Wolf bonding number can not be considered as an acceptable measure for the internal bonding of a research group or community. This is shown by a construction where adding the same number...
Reflections on the age distribution of Japanese scientists (2006)
Asonuma, Akihiro, Fang, Yong, ROUSSEAU, Ronald
The age distribution of a country's scientists is an important element in the study of its research capacity. In this article we investigate the age distribution of Japanese scientists in order to...
A case study : evolution of JASIS' Hirsch index (2006)
The evolution of the Hirsch index of the Journal of the American Society of Information Science over the period 1991-2000 is studied using a variable citation window. A relative h-index is introduced.
Simple models and the corresponding h- and g-index (2006)
The relation between the Hirsch index and Egghe’s g-index is determined for some simple models such as the uniform model, the point model, the linear model and Zipf’s model.
Thoughts about the Stacey & Stacey measures for the logical quality of web searches (2006)
The Stacey & Stacey formula for the quality of AND web queries is analyzed and explained, leading to a proposal for a simplified alternative. Examples clarify the procedure.
New developments related to the Hirsch index (2006)
It is shown that the h-index on the one hand, and the A- and g-indices on the other, measure different things. The A-index, however, seems overly sensitive to one extremely highly cited article. For...
This paper extends the Lorenz theory, developed in [L. Egghe and R. Rousseau. Symmetric and asymmetric theory of relative concentration and applications. Scientometrics 52(2), 261-290, 2001], so that...
This paper extends the Lorenz theory, developed in [L. Egghe and R. Rousseau. Symmetric and asymmetric theory of relative concentration and applications. Scientometrics 52(2), 261-290, 2001], so that...
This paper extends the Lorenz theory, developed in [L. Egghe and R. Rousseau. Symmetric and asymmetric theory of relative concentration and applications. Scientometrics 52(2), 261-290, 2001], so that...
Another look at small worlds: one node set - two link structures (2005)
I present another view on the small world phenomenon: mathematically it can be considered as a consequence of having two graphs with the same net of nodes, but with a different link structure.
China's exponential growth in science and the contribution of firms (2005)
It is shown that for all essential scientific and technological indicators China shows an exponential increase. Only for the number of R&D personnel the increase is linear. Special attention goes to...
Q-measures for binary divided networks: an investigation within the field of informetrics (2005)
Q-measures for binary divided networks, as introduced by Flom, Friedman, Strauss and Neaigus are studied. These measures try to capture the idea of bridges between two groups in a connected...
Comparing partial and truncated conglomerates from a concentration theoretic point of view (2005)
When studying numerical properties of a population (technically: a conglomerate) it often happens that not all data are known. It might be that the total number of objects (persons) in the population...
Classical information retrieval and overlap measures such as the Jaccard index, the Dice coefficient and Salton's cosine measure can be characterized by Lorenz curves. This result demonstrates the...
China's quantitative expansion phase: exponential growth but low impact (2005)
This is a slightly revised, unpublished version of the actual conference paper.
Q-measures for binary divided networks: an investigation within the field of informetrics (2005)
Q-measures for binary divided networks, as introduced by Flom, Friedman, Strauss and Neaigus are studied. These measures try to capture the idea of bridges between two groups in a connected...
Comparing partial and truncated conglomerates from a concentration theoretic point of view (2005)
When studying numerical properties of a population (technically: a conglomerate) it often happens that not all data are known. It might be that the total number of objects (persons) in the population...
Classical information retrieval and overlap measures such as the Jaccard index, the Dice coefficient and Salton's cosine measure can be characterized by Lorenz curves. This result demonstrates the...
China's quantitative expansion phase: exponential growth but low impact (2005)
This is a slightly revised, unpublished version of the actual conference paper.
Q-measures for binary divided networks: an investigation within the field of informetrics (2005)
Q-measures for binary divided networks, as introduced by Flom, Friedman, Strauss and Neaigus are studied. These measures try to capture the idea of bridges between two groups in a connected...
Comparing partial and truncated conglomerates from a concentration theoretic point of view (2005)
When studying numerical properties of a population (technically: a conglomerate) it often happens that not all data are known. It might be that the total number of objects (persons) in the population...
Classical information retrieval and overlap measures such as the Jaccard index, the Dice coefficient and Salton's cosine measure can be characterized by Lorenz curves. This result demonstrates the...
China's quantitative expansion phase: exponential growth but low impact (2005)
This is a slightly revised, unpublished version of the actual conference paper.
Q-measures for binary divided networks: an investigation within the field of informetrics (2005)
Q-measures for binary divided networks, as introduced by Flom, Friedman, Strauss and Neaigus are studied. These measures try to capture the idea of bridges between two groups in a connected...
Median and percentile impact factors: A set of new indicators (2005)
In a recent article Sombatsompop et al. (2004) proposed a new way of calculating a synchronous journal impact factor. Their proposal seems quite interesting and will be discussed in this note. Their...
Jin, BH, ROUSSEAU, Ronald, Sun, XX
The introduction, construction and upgrading of a system of key labs and open labs are all results of a major S&T system reform in mainland China. A series of programmes extending over a period of 20...
Another look at small worlds: one node set - two link structures (2005)
I present another view on the small world phenomenon: mathematically it can be considered as a consequence of having two graphs with the same net of nodes, but with a different link structure.
China's exponential growth in science and the contribution of firms (2005)
It is shown that for all essential scientific and technological indicators China shows an exponential increase. Only for the number of R&D personnel the increase is linear. Special attention goes to...
Q-measures for binary divided networks: an investigation within the field of informetrics (2005)
Q-measures for binary divided networks, as introduced by Flom, Friedman, Strauss and Neaigus are studied. These measures try to capture the idea of bridges between two groups in a connected...
Similarity between objects (documents, persons, answers to a questionnaire, etc.) is generally determined through relations between representations of these objects. In the case of binary...
A local hierarchy theory for acyclic digraphs (2004)
Local hierarchy theory focuses on direct links in acyclic digraphs. In- and out-degrees are used to determine the local hierarchical number for each vertex in the graph. Together, these local...
How to measure own-group preference? A novel approach to a sociometric problem (2004)
In this article we present a precise definition of the notion "own-group preference" and characterize all functions capable of correctly measuring it. Examples of such functions are provided. The...
Similarity between objects (documents, persons, answers to a questionnaire, etc.) is generally determined through relations between representations of these objects. In the case of binary...
A local hierarchy theory for acyclic digraphs (2004)
Local hierarchy theory focuses on direct links in acyclic digraphs. In- and out-degrees are used to determine the local hierarchical number for each vertex in the graph. Together, these local...
How to measure own-group preference? A novel approach to a sociometric problem (2004)
In this article we present a precise definition of the notion "own-group preference" and characterize all functions capable of correctly measuring it. Examples of such functions are provided. The...
The role of China's English-language scientific journals in scientific communication (2004)
Between 1929 and 2002 over 200 English-language scientific journals were founded in China. The number of China's English edition journals in each discipline is, however, not correlated to the...
A local hierarchy theory for acyclic diagraphs (2004)
Local hierarchy theory focuses on direct links in acyclic digraphs. In- and out-degrees are used to determine the local hierarchical number for each vertex in the graph. Together, these local...
Similarity between objects (documents, persons, answers to a questionnaire, etc.) is generally determined through relations between representations of these objects. In the case of binary...
A local hierarchy theory for acyclic digraphs (2004)
Local hierarchy theory focuses on direct links in acyclic digraphs. In- and out-degrees are used to determine the local hierarchical number for each vertex in the graph. Together, these local...
How to measure own-group preference? A novel approach to a sociometric problem (2004)
In this article we present a precise definition of the notion "own-group preference" and characterize all functions capable of correctly measuring it. Examples of such functions are provided. The...
The role of China's English-language scientific journals in scientific communication (2004)
Between 1929 and 2002 over 200 English-language scientific journals were founded in China. The number of China's English edition journals in each discipline is, however, not correlated to the...
A local hierarchy theory for acyclic diagraphs (2004)
Local hierarchy theory focuses on direct links in acyclic digraphs. In- and out-degrees are used to determine the local hierarchical number for each vertex in the graph. Together, these local...
Power laws, such as Zipf s law, and exponential relations, leading to straight lines in logarithmic or semi-logarithmic scales, are presented in a unified setting. It is shown that the class of...
The Byline: Thoughts on the distribution of author ranks in multiauthored papers (2003)
Liming, Liang, Rousseau, Ronald
We analyze the multi-authorship matrix M, defined as the matrix where a cell M(j,k) denotes the number of times authors with j publications are ranked as kth author of an article. We prove that if...
This article brings the underlying structure of different relative indicators to the forefront. Special attention is given to the relative impact of a journal within a set of journals, a so-called...
A measure for the cohesion of weighted networks (2003)
A generalization of both the Botafogo-Rivlin-Shneiderman compactness measure and the Wiener index is presented. These new measures for the cohesion of networks can be used in case a dissimilarity...
Compactness as introduced by Botafogo, Rivlin and Shneiderman, in short: BRS-compactness, is studied in general, as it can be used to describe the cohesion of parts of the internet or collaboration...
Power laws, such as Zipf s law, and exponential relations, leading to straight lines in logarithmic or semi-logarithmic scales, are presented in a unified setting. It is shown that the class of...
The Byline: Thoughts on the distribution of author ranks in multiauthored papers (2003)
Liming, Liang, Rousseau, Ronald
We analyze the multi-authorship matrix M, defined as the matrix where a cell M(j,k) denotes the number of times authors with j publications are ranked as kth author of an article. We prove that if...
This article brings the underlying structure of different relative indicators to the forefront. Special attention is given to the relative impact of a journal within a set of journals, a so-called...
A measure for the cohesion of weighted networks (2003)
A generalization of both the Botafogo-Rivlin-Shneiderman compactness measure and the Wiener index is presented. These new measures for the cohesion of networks can be used in case a dissimilarity...
Compactness as introduced by Botafogo, Rivlin and Shneiderman, in short: BRS-compactness, is studied in general, as it can be used to describe the cohesion of parts of the internet or collaboration...
Power laws, such as Zipf s law, and exponential relations, leading to straight lines in logarithmic or semi-logarithmic scales, are presented in a unified setting. It is shown that the class of...
The Byline: Thoughts on the distribution of author ranks in multiauthored papers (2003)
EGGHE, Leo, Liming, Liang, ROUSSEAU, Ronald
We analyze the multi-authorship matrix M, defined as the matrix where a cell M(j,k) denotes the number of times authors with j publications are ranked as kth author of an article. We prove that if...
This article brings the underlying structure of different relative indicators to the forefront. Special attention is given to the relative impact of a journal within a set of journals, a so-called...
A measure for the cohesion of weighted networks (2003)
A generalization of both the Botafogo-Rivlin-Shneiderman compactness measure and the Wiener index is presented. These new measures for the cohesion of networks can be used in case a dissimilarity...
Compactness as introduced by Botafogo, Rivlin and Shneiderman, in short: BRS-compactness, is studied in general, as it can be used to describe the cohesion of parts of the internet or collaboration...
Yu, Y., Chan, L., Jin, B., ROUSSEAU, Ronald, Vaughan, L.
A quantitative analysis of newspaper coverage of SARS was conducted, where the occurrence of the word SARS in newspaper articles, rather than newspaper content was examined. Data were collected from...
Chee Yuk Chan, Linda, Bains, Jin, Rousseau, Ronald, Vaughan, Liwen, Yu, Yuan
A quantitative analysis of newspaper coverage of SARS was conducted, where the occurrence of the word SARS in newspaper articles, rather than newspaper content was examined. Data were collected from...
Chee Yuk Chan, Linda, Bains, Jin, Rousseau, Ronald, Vaughan, Liwen, Yu, Yuan
A quantitative analysis of newspaper coverage of SARS was conducted, where the occurrence of the word SARS in newspaper articles, rather than newspaper content was examined. Data were collected from...
Rousseau, Ronald, Vandecasteele, Iris
Research on digital libraries encompasses a range of intertwined technical, social and political issues. Before studying who is using which part of your digital library, and how digital documents are...
Determining the core of a field"s literature, i.e. its "most important" sources, has been and still is an important problem in bibliometrics. In this article an exact definition of a core of a...
Co-citation, bibliographic coupling and a characterization of lattice citation networks (2002)
In this article we study directed, acyclic graphs. We introduce the head and tail order relations and study some of their properties. Recalling the notions of generalized bibliographic coupling and...
International visibility of Chinese scientific journals (2002)
Ren, Shengli, Rousseau, Ronald
Acknowledgements go to Zhang Yuhua (ISTIC), Xiao Long (Beijing University), and Jin Bihui (DICCAS)
Claude Shannon: Scientist - Engineer (2002)
An overview is presented of the life and work of Claude Shannon, who died begin 2001. Shannon is a pioneer in many fields of science. He introduced Boolean algebra in switching theory, is the...
Determining the core of a field"s literature, i.e. its "most important" sources, has been and still is an important problem in bibliometrics. In this article an exact definition of a core of a...
Co-citation, bibliographic coupling and a characterization of lattice citation networks (2002)
In this article we study directed, acyclic graphs. We introduce the head and tail order relations and study some of their properties. Recalling the notions of generalized bibliographic coupling and...
International visibility of Chinese scientific journals (2002)
Ren, Shengli, Rousseau, Ronald
Acknowledgements go to Zhang Yuhua (ISTIC), Xiao Long (Beijing University), and Jin Bihui (DICCAS)
Claude Shannon: Scientist - Engineer (2002)
An overview is presented of the life and work of Claude Shannon, who died begin 2001. Shannon is a pioneer in many fields of science. He introduced Boolean algebra in switching theory, is the...
Lack of standard procedures hinders progress in scientometric and bibliometric research. Provoked by a recent publication in the journal Scientometrics, we consider in particular the problem of how...
International visibility of Chinese scientific journals (2002)
We discuss the internationalisation and the visibility of Chinese journals covered by the Institute for Scientific Information (ISI), Attention is focused on physics and chemistry journals. For these...
A general frame-work for relative impact indicators (2002)
This article brings the underlying structure of different relative indicators to the forefront. This leads to a powerful device for constructing new indicators. Special attention is given to the...
Determining the core of a field's literature, i.e. its 'most important' sources, has been and still is an important problem in bibliometrics. In this article an exact definition of a core of a...
Co-citation, bibliographic coupling and a characterization of lattice citation networks (2002)
In this article we study directed, acyclic graphs. We introduce the head and tail order relations and study some of their properties. Recalling the notions of generalized bibliographic coupling and...
International visibility of Chinese scientific journals (2002)
Ren, Shengli, ROUSSEAU, Ronald
Acknowledgements go to Zhang Yuhua (ISTIC), Xiao Long (Beijing University), and Jin Bihui (DICCAS)
Claude Shannon: Scientist - Engineer (2002)
An overview is presented of the life and work of Claude Shannon, who died begin 2001. Shannon is a pioneer in many fields of science. He introduced Boolean algebra in switching theory, is the...
Lack of standard procedures hinders progress in scientometric and bibliometric research. Provoked by a recent publication in the journal Scientometrics, we consider in particular the problem of how...
A general frame-work for relative impact indicators (2002)
This article brings the underlying structure of different relative indicators to the forefront. This leads to a powerful device for constructing new indicators. Special attention is given to the...
Rousseau, Ronald, Vandecasteele, Iris
Research on digital libraries encompasses a range of intertwined technical, social and political issues. Before studying who is using which part of your digital library, and how digital documents are...
Indicadores bibliométricos y econométricos en la evaluación de instituciones científicas (2001)
This article consists of two parts: the first part describes the evaluation of a small university it is based on scientometric data and aims mainly at the evaluation of internationally visible...
Determining the core of a field's literature. i.e. its 'most important' sources, has been and still is an important problem in bibliomehics. In this article an exact definition of a core of a...
Symmetric and Asymmetric Theory of Relative Concentration and Applications (2001)
Relative concentration theory studies the degree of inequality between two vectors (a1,...,aN) and (agr1,...,agrN). It extends concentration theory in the sense that, in the latter theory, one of the...
The detection of double errors in ISBN- and ISSN-like codes (2001)
Coding of the ISBN and ISSN is studied, and possible alternatives, not all equivalent to the official ones, are formulated. A minimum requirement for a useful code is that all single errors as well...
Paper published without the figures (included here)
Determining the core of a field's literature. i.e. its 'most important' sources, has been and still is an important problem in bibliomehics. In this article an exact definition of a core of a...
Symmetric and Asymmetric Theory of Relative Concentration and Applications (2001)
Relative concentration theory studies the degree of inequality between two vectors (a1,...,aN) and (agr1,...,agrN). It extends concentration theory in the sense that, in the latter theory, one of the...
The detection of double errors in ISBN- and ISSN-like codes (2001)
Coding of the ISBN and ISSN is studied, and possible alternatives, not all equivalent to the official ones, are formulated. A minimum requirement for a useful code is that all single errors as well...
Paper published without the figures (included here)
Lun wen-yin wen ju zhen ji qi tui dao de ling liang ping jia zhi biao (2001)
ROUSSEAU, Ronald, Ingwersen, Peter, Larsen, Birger, Russell, Jane
The publication-citation matrix and its derived quantities (2001)
ROUSSEAU, Ronald, Ingwersen, Peter, Larsen, Birger, Russell, Jane
Determining the core of a field's literature. i.e. its 'most important' sources, has been and still is an important problem in bibliomehics. In this article an exact definition of a core of a...
Symmetric and Asymmetric Theory of Relative Concentration and Applications (2001)
Relative concentration theory studies the degree of inequality between two vectors (a1,...,aN) and (agr1,...,agrN). It extends concentration theory in the sense that, in the latter theory, one of the...
The detection of double errors in ISBN- and ISSN-like codes (2001)
Coding of the ISBN and ISSN is studied, and possible alternatives, not all equivalent to the official ones, are formulated. A minimum requirement for a useful code is that all single errors as well...
Paper published without the figures (included here)
Lun wen-yin wen ju zhen ji qi tui dao de ling liang ping jia zhi biao (2001)
ROUSSEAU, Ronald, Ingwersen, Peter, Larsen, Birger, Russell, Jane
The publication-citation matrix and its derived quantities (2001)
ROUSSEAU, Ronald, Ingwersen, Peter, Larsen, Birger, Russell, Jane
Indicadores bibliométricos y econométricos en la evaluación de instituciones científicas (2001)
This article consists of two parts: the first part describes the evaluation of a small university it is based on scientometric data and aims mainly at the evaluation of internationally visible...
LOTKA: A program to fit a power law distribution to observed frequency data. (2000)
Rousseau, Brendan, Rousseau, Ronald
LOTKA, a computer program for fitting a power law distribution such as Lotka's is presented. It basically follows Nicholl's methodology : using a maximum likelihood approach to estimate parameters,...
LOTKA: A program to fit a power law distribution to observed frequency data. (2000)
Rousseau, Brendan, Rousseau, Ronald
LOTKA, a computer program for fitting a power law distribution such as Lotka's is presented. It basically follows Nicholl's methodology : using a maximum likelihood approach to estimate parameters,...
Aging, obsolescence, impact, growth and utilization: definitions and relations (2000)
The notions aging, obsolescence, impact, growth, utilization and their relations are studied. It is shown how to correct an observed citation distribution for growth, once the growth distribution is...
Partial orders and measures for language preferences (2000)
The Protein Annotators' Assistant (or PAA) (http://www.ebi.ac.uk/paa/) is a software system which assists protein annotators in the task of assigning functions to newly sequenced proteins. Working...
Rousseau, Ronald, Van Hooydonk, G.
One aim of science evaluation studies is to determine quantitatively the contribution of different players (authors, departments, countries) to the whole system. This information is then used to...
Observed aging curves are influenced by publication delays. In this article, we show how the undisturbed aging function and the publication delay combine to give the observed aging function. This...
Bogaert, Jan, Rousseau, Ronald, Van Hecke, Piet
It is shown how Bradford curves, i.e. cumulative rank-frequency functions, can describe the fragment size distribution of percolation models. This interesting fact is explained by arguing that some...
Aging, obsolescence, impact, growth and utilization: definitions and relations (2000)
The notions aging, obsolescence, impact, growth, utilization and their relations are studied. It is shown how to correct an observed citation distribution for growth, once the growth distribution is...
Partial orders and measures for language preferences (2000)
The Protein Annotators' Assistant (or PAA) (http://www.ebi.ac.uk/paa/) is a software system which assists protein annotators in the task of assigning functions to newly sequenced proteins. Working...
Rousseau, Ronald, Van Hooydonk, G.
One aim of science evaluation studies is to determine quantitatively the contribution of different players (authors, departments, countries) to the whole system. This information is then used to...
Observed aging curves are influenced by publication delays. In this article, we show how the undisturbed aging function and the publication delay combine to give the observed aging function. This...
Bogaert, Jan, Rousseau, Ronald, Van Hecke, Piet
It is shown how Bradford curves, i.e. cumulative rank-frequency functions, can describe the fragment size distribution of percolation models. This interesting fact is explained by arguing that some...
Output-financing at LUC (2000)
LUC's research council stimulates research by allocating a part of its funds based on results. The output-financing scheme is presented and its role in the university's research policy is explained....
Aging, obsolescence, impact, growth and utilization: definitions and relations (2000)
The notions aging, obsolescence, impact, growth, utilization and their relations are studied. It is shown how to correct an observed citation distribution for growth, once the growth distribution is...
Partial orders and measures for language preferences (2000)
Relative own-language preference depends on two parameters: the publication share of the language, and the self-citing rate, Openness of language L with respect to language J depends on three...
EGGHE, Leo, ROUSSEAU, Ronald, Van Hooydonk, G.
One aim of science evaluation studies is to determine quantitatively the contribution of different players (authors, departments, countries) to the whole system. This information is then used to...
Observed aging curves are influenced by publication delays. In this article, we show how the undisturbed aging function and the publication delay combine to give the observed aging function. This...
Bogaert, Jan, ROUSSEAU, Ronald, Van Hecke, Piet
It is shown how Bradford curves, i.e. cumulative rank-frequency functions, can describe the fragment size distribution of percolation models. This interesting fact is explained by arguing that some...
Output-financing at LUC (2000)
LUC's research council stimulates research by allocating a part of its funds based on results. The output-financing scheme is presented and its role in the university's research policy is explained....
The"own-language preference": measures of "relative language seff-citation" (1999)
Rousseau, Ronald, Yitzhaki, M.
It has already been pointed out that the foreign language barrier is probably the greatest impediment to the free flow and transfer of information. This barrier is even growing as scientists of more...
Optimal fines in libraries and documentation centers (1999)
Rousseau, Sandra, Rousseau, Ronald
In this paper we try to determine the optimal level of the fines imposed on library users. These fines are levied to deter people from keeping books too long or even damage or steal them. The fines...
The"own-language preference": measures of "relative language seff-citation" (1999)
Rousseau, Ronald, Yitzhaki, M.
It has already been pointed out that the foreign language barrier is probably the greatest impediment to the free flow and transfer of information. This barrier is even growing as scientists of more...
Optimal fines in libraries and documentation centers (1999)
Rousseau, Sandra, Rousseau, Ronald
In this paper we try to determine the optimal level of the fines imposed on library users. These fines are levied to deter people from keeping books too long or even damage or steal them. The fines...
A unified method of counting international and domestic articles (1999)
ROUSSEAU, Ronald, Jin, Bihui, Wang, Shouyang, Wang, Bing, Wu, Zhenxin, Liu, Xiaomin, ...
The"own-language preference": measures of "relative language seff-citation" (1999)
EGGHE, Leo, ROUSSEAU, Ronald, Yitzhaki, M.
It has already been pointed out that the foreign language barrier is probably the greatest impediment to the free flow and transfer of information. This barrier is even growing as scientists of more...
Optimal fines in libraries and documentation centers (1999)
Rousseau, Sandra, ROUSSEAU, Ronald
In this paper we try to determine the optimal level of the fines imposed on library users. These fines are levied to deter people from keeping books too long or even damage or steal them. The fines...
A unified method of counting international and domestic articles (1999)
ROUSSEAU, Ronald, Jin, Bihui, Wang, Shouyang, Wang, Bing, Wu, Zhenxin, Liu, Xiaomin, ...
Indicadores bibliométricos e econométricos para a avaliação de instituições científicas (1998)
O artigo é dividido em duas partes. A primeira descreve a avaliação de uma pequena universidade, baseada em dados cienciométricos tendo por principal objetivo avaliar a pesquisa com visibilidade...
Daily time series of common single word searches in AltaVista and NorthernLight (1998)
Over the past year the AltaVista search engine provided irregular numbers of hits. This is shown by collecting a time series of daily searches. The new AltaVista (on the Web since October 25, 1999)...
Daily time series of common single word searches in AltaVista and NorthernLight (1998)
Over the past year the AltaVista search engine provided irregular numbers of hits. This is shown by collecting a time series of daily searches. The new AltaVista (on the Web since October 25, 1999)...
Topologies for retrieval systems are generated by certain subsets, called retrievals. In this article we show how recall and precision can be expressed using only retrievals. Different types of...
Topological aspects of information retrieval (1998)
Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D. M. Everett and...
Topologies for retrieval systems are generated by certain subsets, called retrievals. In this article we show how recall and precision can be expressed using only retrievals. Different types of...
Topological aspects of information retrieval (1998)
Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D. M. Everett and...
Topologies for retrieval systems are generated by certain subsets, called retrievals. In this article we show how recall and precision can be expressed using only retrievals. Different types of...
Topological aspects of information retrieval (1998)
Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D. M. Everett and...
Sitations: an exploratory study. (1997)
We investigate the distribution of domain names and the distribution of links between web sites. It is shown that the Lotka function provides an adequate description. The percentage of self-sitations...
Sitations: an exploratory study. (1997)
We investigate the distribution of domain names and the distribution of links between web sites. It is shown that the Lotka function provides an adequate description. The percentage of self-sitations...
Duality in information retrieval and the hypergeometric distribution (1997)
Duality is an important topic in informetrics, especially in connection with the classical informetric laws. Yet, this concept is less studied in information retrieval. It deals with the unification...
Duality in information retrieval and the hypergeometric distribution (1997)
Duality is an important topic in informetrics, especially in connection with the classical informetric laws. Yet, this concept is less studied in information retrieval. It deals with the unification...
Data Envelopment Analysis as a tool for constructing scientometric indicators (1997)
It is shown that Data Envelopment Analysis (DEA) can be used to construct relative scientific and technological indicators. The method is explained and illustrated using countries as objects of...
Spectral methods for detecting periodicity in library circulation data: a case study (1997)
ROUSSEAU, Ronald, Decroos, Francis, Dierckens, Kris, Pollet, Vincent, Tassignon, Hugo, Verweyen, Koen
Duality in information retrieval and the hypergeometric distribution (1997)
Duality is an important topic in informetrics, especially in connection with the classical informetric laws. Yet, this concept is less studied in information retrieval. It deals with the unification...
Data Envelopment Analysis as a tool for constructing scientometric indicators (1997)
It is shown that Data Envelopment Analysis (DEA) can be used to construct relative scientific and technological indicators. The method is explained and illustrated using countries as objects of...
Spectral methods for detecting periodicity in library circulation data: a case study (1997)
ROUSSEAU, Ronald, Decroos, Francis, Dierckens, Kris, Pollet, Vincent, Tassignon, Hugo, Verweyen, Koen
We prove a theorem about the invariance of the Lotka function under a transformation which maps numbers of authors as variables to number of collaborators as variables. Moreover, we describe a...
Average and global impact of a set of journals (1996)
In this note we clarify some notions concerning citations, publications, and their quotients: impact and indifference (a measure of invisibility, introduced in this article). In particular, we show...
Averaging and globalising quotients of informetric and scientometric data (1996)
Based on the particular case of the average impact factor of a subfield versus the impact factor of this subfield as a whole, the difference is studied between an average of quotients, denoted as AQ,...
Stochastic processes determined by a general success-breeds-success principle (1996)
The general ''success-breeds-success'' (SBS) principle as introduced in a previous paper extends the classical SBS principle in that the allocation of items over sources is determined by a more...
A research model is proposed to prove or disprove the dependence of a field list of internationally visible journals on the initial set. Applications of the experiment are outlined. A conjecture is...
We prove a theorem about the invariance of the Lotka function under a transformation which maps numbers of authors as variables to number of collaborators as variables. Moreover, we describe a...
Average and global impact of a set of journals (1996)
In this note we clarify some notions concerning citations, publications, and their quotients: impact and indifference (a measure of invisibility, introduced in this article). In particular, we show...
Averaging and globalising quotients of informetric and scientometric data (1996)
Based on the particular case of the average impact factor of a subfield versus the impact factor of this subfield as a whole, the difference is studied between an average of quotients, denoted as AQ,...
Stochastic processes determined by a general success-breeds-success principle (1996)
The general ''success-breeds-success'' (SBS) principle as introduced in a previous paper extends the classical SBS principle in that the allocation of items over sources is determined by a more...
A research model is proposed to prove or disprove the dependence of a field list of internationally visible journals on the initial set. Applications of the experiment are outlined. A conjecture is...
ON THE INFLUENCE OF PRODUCTION ON UTILIZATION FUNCTIONS - OBSOLESCENCE OR INCREASED USE (1995)
EGGHE, Leo, RAO, Ravichandra, ROUSSEAU, Ronald
We study the influence of production on utilization functions. A concrete example of this is the influence of the growth of literature on the obsolescence (aging) of this literature. Here,...
SENSITIVITY ASPECTS OF INEQUALITY MEASURES (1995)
The purpose of this article is to study inequality measures with respect to their sensitivity to transfers. Sensitivity is studied by means of a particular directional derivative. We observe that...
The success-breeds-success principle (SBS principle) is reformulated in order to generate a general theory of source-item relationships. Several extensions are included such as a time-dependent...
ON THE INFLUENCE OF PRODUCTION ON UTILIZATION FUNCTIONS - OBSOLESCENCE OR INCREASED USE (1995)
EGGHE, Leo, RAO, Ravichandra, ROUSSEAU, Ronald
We study the influence of production on utilization functions. A concrete example of this is the influence of the growth of literature on the obsolescence (aging) of this literature. Here,...
SENSITIVITY ASPECTS OF INEQUALITY MEASURES (1995)
The purpose of this article is to study inequality measures with respect to their sensitivity to transfers. Sensitivity is studied by means of a particular directional derivative. We observe that...
The success-breeds-success principle (SBS principle) is reformulated in order to generate a general theory of source-item relationships. Several extensions are included such as a time-dependent...
EVOLUTION OF INFORMATION PRODUCTION PROCESSES AND ITS RELATION TO THE LORENZ DOMINANCE ORDER (1993)
We investigate the evolution and growth of information production processes (in short IPPs). An important role in this investigation is played by the Lorenz curve of concentration and the...
EVOLUTION OF INFORMATION PRODUCTION PROCESSES AND ITS RELATION TO THE LORENZ DOMINANCE ORDER (1993)
We investigate the evolution and growth of information production processes (in short IPPs). An important role in this investigation is played by the Lorenz curve of concentration and the...
TRANSFER PRINCIPLES AND A CLASSIFICATION OF CONCENTRATION MEASURES (1991)
In this article we show that the notion of concentration (or inequality) can best be studied by applying a number of transfer principles. We prove this by showing that transfer principles imply other...
TRANSFER PRINCIPLES AND A CLASSIFICATION OF CONCENTRATION MEASURES (1991)
In this article we show that the notion of concentration (or inequality) can best be studied by applying a number of transfer principles. We prove this by showing that transfer principles imply other...
I. Statistics This part begins with elementary descriptive statistics and elements of probability. It continues with a chapter on inferential statistics, including regression, correlation and...
Introduction to Informetrics (1990)
The book deals with the following topics: informetrics, bibliometrics, scientometrics, descriptive statistics, probability, inferential statistics, sampling, multivariate statistics, operations...
Introduction to Informetrics (1990)
The book deals with the following topics: informetrics, bibliometrics, scientometrics, descriptive statistics, probability, inferential statistics, sampling, multivariate statistics, operations...
Introduction to Informetrics (1990)
The book deals with the following topics: informetrics, bibliometrics, scientometrics, descriptive statistics, probability, inferential statistics, sampling, multivariate statistics, operations...
I. Statistics This part begins with elementary descriptive statistics and elements of probability. It continues with a chapter on inferential statistics, including regression, correlation and...
Citation distribution of pure mathematics journals (1988)
Garfield defined the impact factor of a journal as the ratio of the number of citations which this journal receives in the course of a given year to the number of articles published by that journal...
Citation distribution of pure mathematics journals (1988)
Garfield defined the impact factor of a journal as the ratio of the number of citations which this journal receives in the course of a given year to the number of articles published by that journal...
Citation distribution of pure mathematics journals (1988)
Garfield defined the impact factor of a journal as the ratio of the number of citations which this journal receives in the course of a given year to the number of articles published by that journal...
On indexing in the Web of Science and predicting journal impact factor
Wu, Xiu-fang, Fu, Qiang, Rousseau, Ronald
We discuss what document types account for the calculation of the journal impact factor (JIF) as published in the Journal Citation Reports (JCR). Based on a brief review of articles discussing how to...
Evaluating Environmental and Resource Economics Journals: A TOP-Curve Approach
Sandra Rousseau, Tom Verbeke, Ronald Rousseau
This article applies an alternative approach to the measurement of scholarly quality, namely the use of TOP-curves, in order to rank journals in the field of environmental and resource economics....
Empirical series of journal h-indices: The JCR category Horticulture as a case study
Liu, Yuxian, Rao, I. K. Ravichandra, ROUSSEAU, Ronald
Two types of series of h-indices for journals published in the field of Horticulture during the period 1998-2007 are calculated. Type I h-indices are based on yearly data, while type II h-indices use...
Bibliometric characteristics of the journal Science: Pre-Koshland, Koshland and post-Koshland period
Liang, Liming, ROUSSEAU, Ronald
During the period 1985-1995 Daniel Koshland was Editor-in-Chief of the journal Science. As such he exerted a huge influence on all aspects related to content and lay-out of the journal. This study...
Empirical series of journal h-indices: the JCR category Horticulture as a case study
Liu, Yuxian, RAO, Ravichandra, ROUSSEAU, Ronald
Two types of series of h-indices for journals published in the field of Horticulture during the period 1998-2007 are calculated. Type I h-indices are based on yearly data, while type II h-indices use...