手法を比較

	Brokerage Analysis	Blockmodeling
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1989	1976
提唱者	Roger Gould & Roberto Fernandez	Harrison White, Scott Boorman & Ronald Breiger
種類	Classification of intermediary positions in a network	Network partitioning into positions and a reduced role structure
原典	Gould, R. V., & Fernandez, R. M. (1989). Structures of mediation: A formal approach to brokerage in transaction networks. Sociological Methodology, 19, 89–126.	White, H. C., Boorman, S. A., & Breiger, R. L. (1976). Social structure from multiple networks. I. Blockmodels of roles and positions. American Journal of Sociology, 81(4), 730–780.
別名	Gould-Fernandez brokerage, brokerage roles, brokerage typology, structures of mediation	block modeling, blockmodel analysis, generalized blockmodeling, CONCOR
関連	5	4
概要	Gould-Fernandez brokerage analysis classifies the intermediary positions actors occupy in a network. For every two-path in which an actor v sits between a source i and a target j, the analysis labels v's role according to the group memberships of the three actors, yielding five distinct brokerage types — coordinator, itinerant broker (consultant), gatekeeper, representative, and liaison. Counting how often each actor plays each role reveals who mediates within groups, who controls access across group boundaries, and who bridges otherwise separate communities.	Blockmodeling is a family of methods that simplify a social network by partitioning its actors into positions — groups of actors who are equivalent in their pattern of ties — and summarizing the relations between positions as a compact image, or reduced role structure. Introduced by Harrison White, Scott Boorman, and Ronald Breiger in 1976, it shifts attention from individuals to the structural roles they occupy.