手法を比較

	Triad Census	Blockmodeling
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1970	1976
提唱者	Paul Holland & Samuel Leinhardt	Harrison White, Scott Boorman & Ronald Breiger
種類	Enumeration of the 16 isomorphism classes of directed triads	Network partitioning into positions and a reduced role structure
原典	Holland, P. W., & Leinhardt, S. (1970). A method for detecting structure in sociometric data. American Journal of Sociology, 76(3), 492–513.	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	triad count, triadic census, 16-type triad census, MAN triad census	block modeling, blockmodel analysis, generalized blockmodeling, CONCOR
関連	4	4
概要	The triad census counts how many of a directed network's three-actor subgroups fall into each of the 16 possible types of triad, providing a compact fingerprint of the network's local structure. Introduced by Paul Holland and Samuel Leinhardt in 1970, it is the standard way to test structural theories — balance, clustering, transitivity, ranked clusters — by comparing the observed distribution of triad types against what a random network would produce.	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.