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| Blockmodeling× | Isolation Index× | |
|---|---|---|
| Campo | Sociology | Sociology |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1976 | 1954 |
| Ideatore≠ | Harrison White, Scott Boorman & Ronald Breiger | Wendell Bell (formalization of P* indices) |
| Tipo≠ | Network partitioning into positions and a reduced role structure | Exposure-dimension segregation index |
| Fonte seminale≠ | 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 ↗ | Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364. DOI ↗ |
| Alias | block modeling, blockmodel analysis, generalized blockmodeling, CONCOR | P* isolation index, interaction index, exposure index, Bell isolation index |
| Correlati≠ | 4 | 5 |
| Sintesi≠ | 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. |
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