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| Triad Census× | Blockmodeling× | |
|---|---|---|
| Campo | Sociology | Sociology |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1970 | 1976 |
| Ideatore≠ | Paul Holland & Samuel Leinhardt | Harrison White, Scott Boorman & Ronald Breiger |
| Tipo≠ | Enumeration of the 16 isomorphism classes of directed triads | Network partitioning into positions and a reduced role structure |
| Fonte seminale≠ | Holland, P. W., & Leinhardt, S. (1970). A method for detecting structure in sociometric data. American Journal of Sociology, 76(3), 492–513. DOI ↗ | 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. DOI ↗ |
| Alias | triad count, triadic census, 16-type triad census, MAN triad census | block modeling, blockmodel analysis, generalized blockmodeling, CONCOR |
| Correlati | 4 | 4 |
| Sintesi≠ | 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. |
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