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	二部ネットワーク分析	Betweenness Centrality
分野	ネットワーク分析	ネットワーク分析
系統	Machine learning	Machine learning
提唱年	1974	1977
提唱者	Breiger, R. L.	Freeman, L. C.
種類	Bipartite graph analysis	Centrality measure
原典	Breiger, R. L. (1974). The duality of persons and groups. Social Forces, 53(2), 181–190.	Freeman, L. C. (1977). A set of measures of centrality based on betweenness. Sociometry, 40(1), 35–41.
別名	bipartite network analysis, affiliation network analysis, two-mode SNA, dual-projection network analysis	Freeman betweenness, BC, geodesic betweenness, shortest-path betweenness
関連	5	6
概要	Two-mode network analysis examines networks built from two distinct types of nodes — such as actors and events, authors and papers, or companies and board members — connected only across types. By analysing this bipartite structure directly or projecting it onto one-mode networks, researchers uncover affiliation patterns, shared memberships, and structural duality that are invisible in standard one-mode social network analysis.	Betweenness centrality, formalized by Linton C. Freeman in 1977, measures how often a node lies on the shortest path connecting every other pair of nodes in a network. High-betweenness nodes act as bridges or brokers: removing them fragments the network into disconnected components more severely than removing any other nodes.