Módszerek összehasonlítása

	Bibliometriai törvények: Lotka, Bradford és Zipf törvényei	Ko-idézéselemzés	Tudománytérkép
Tudományterület	Bibliometria	Bibliometria	Bibliometria
Módszercsalád	Process / pipeline	Process / pipeline	Process / pipeline
Keletkezés éve	1926–1949	1973	2000s
Megalkotó	Alfred J. Lotka, Samuel C. Bradford, George K. Zipf	Henry Small	Katy Börner, Chaomei Chen, and others
Típus	Concept	Method	Method
Alapmű	Lotka, A. J. (1926). The frequency distribution of scientific productivity. Journal of the Washington Academy of Sciences, 16(12), 317–323.	Small, H. (1973). Co-citation in the scientific literature: A new measure of the relationship between two documents. Journal of the American Society for Information Science, 24(4), 265–269.	Börner, K., Chen, C., & Boyack, K. W. (2003). Visualizing knowledge domains. Annual Review of Information Science and Technology, 37, 179–255.
Alternatív nevek	bibliometric distributions, productivity laws, frequency laws, information science laws	co-citation mapping, historiograph, direct citation, citation pair analysis	knowledge mapping, domain mapping, research landscape visualization
Kapcsolódó	3	5	5
Összefoglaló	Three foundational empirical laws describe the structure and distribution of scientific information: Lotka's Law characterizes author productivity (most authors publish few papers; a few publish many), Bradford's Law describes journal concentration (a small number of core journals contain the majority of papers on a topic), and Zipf's Law models word and term frequency (word frequency inversely proportional to its rank). These regularities, discovered in the mid-20th century, are remarkably robust across disciplines and have become essential tools for understanding research productivity, organizing information resources, and designing search strategies.	Co-citation analysis is a method that identifies the intellectual structure of a research domain by examining how frequently pairs of documents are cited together in other publications. When two papers are frequently cited together in the literature, they are considered co-cited, indicating they are conceptually related or influential within the same research community. Developed by Henry Small in 1973, co-citation analysis maps the 'invisible colleges' of science—networks of researchers working on related problems—and reveals how knowledge domains evolve over time.	Science mapping is a bibliometric visualization method that creates visual representations of research domains, showing the structure, development, and relationships of scientific fields. Using bibliographic data (citations, keywords, authors, journals), science mapping algorithms generate network diagrams where nodes represent documents, concepts, or authors and edges represent relationships (citation, collaboration, semantic similarity). The resulting maps make invisible intellectual structures visible, enabling researchers to understand field topology, identify emerging areas, and navigate disciplinary landscapes. Pioneered by Börner, Chen, and Boyack in the 2000s, science mapping has become a standard tool in research evaluation and strategic planning.