手法を比較

	書誌計量学的法則：ロットカの法則、ブラッドフォードの法則、ジップの法則	サイエンスマッピング
分野	計量書誌学	計量書誌学
系統	Process / pipeline	Process / pipeline
提唱年	1926–1949	2000s
提唱者	Alfred J. Lotka, Samuel C. Bradford, George K. Zipf	Katy Börner, Chaomei Chen, and others
種類	Concept	Method
原典	Lotka, A. J. (1926). The frequency distribution of scientific productivity. Journal of the Washington Academy of Sciences, 16(12), 317–323.	Börner, K., Chen, C., & Boyack, K. W. (2003). Visualizing knowledge domains. Annual Review of Information Science and Technology, 37, 179–255.
別名	bibliometric distributions, productivity laws, frequency laws, information science laws	knowledge mapping, domain mapping, research landscape visualization
関連	3	5
概要	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.	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.