手法を比較

	Blockmodeling	Isolation Index
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1976	1954
提唱者	Harrison White, Scott Boorman & Ronald Breiger	Wendell Bell (formalization of P* indices)
種類	Network partitioning into positions and a reduced role structure	Exposure-dimension segregation index
原典	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.	Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364.
別名	block modeling, blockmodel analysis, generalized blockmodeling, CONCOR	P* isolation index, interaction index, exposure index, Bell isolation index
関連	4	5
概要	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.	The isolation index measures the exposure dimension of segregation: the extent to which members of a minority group are exposed only to one another rather than to members of other groups. It answers the question 'what is the own-group share of the typical neighbor (or classmate, or coworker) that a member of the focal group encounters?' Unlike evenness measures, it depends on the relative size of the group as well as its spatial distribution.