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| Isolation Index× | Theil Segregation Index× | |
|---|---|---|
| Fachgebiet | Sociology | Sociology |
| Familie | Process / pipeline | Process / pipeline |
| Entstehungsjahr≠ | 1954 | 1971 |
| Urheber≠ | Wendell Bell (formalization of P* indices) | Henri Theil & Anthony Finizza |
| Typ≠ | Exposure-dimension segregation index | Entropy-based multigroup segregation index |
| Wegweisende Quelle≠ | Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364. DOI ↗ | Theil, H., & Finizza, A. J. (1971). A note on the measurement of racial integration of schools by means of informational concepts. Journal of Mathematical Sociology, 1(2), 187–193. DOI ↗ |
| Aliasnamen | P* isolation index, interaction index, exposure index, Bell isolation index | Theil's H, information theory index, entropy segregation index, multigroup entropy index |
| Verwandt | 5 | 5 |
| Zusammenfassung≠ | 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. | Theil's information index, denoted H, is an entropy-based measure of segregation that, unlike the two-group dissimilarity index, handles any number of groups at once. It compares the diversity (entropy) found within each unit to the diversity of the whole population: segregation is high when units are internally homogeneous even though the overall population is diverse. Its defining virtue is exact decomposability across nested levels and across groups. |
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