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| Geary's C× | Indicatori Locali di Associazione Spaziale (LISA)× | |
|---|---|---|
| Campo | Analisi spaziale | Analisi spaziale |
| Famiglia | Regression model | Regression model |
| Anno di origine≠ | 1954 | 1995 |
| Ideatore≠ | Roy C. Geary | Luc Anselin |
| Tipo≠ | Spatial autocorrelation statistic | Local spatial statistic |
| Fonte seminale≠ | Geary, R. C. (1954). The Contiguity Ratio and Statistical Mapping. The Incorporated Statistician, 5(3), 115–145. link ↗ | Anselin, L. (1995). Local Indicators of Spatial Association — LISA. Geographical Analysis, 27(2), 93–115. DOI ↗ |
| Alias | Geary contiguity ratio, Geary C statistic, spatial contiguity ratio, Geary's c | LISA, local spatial autocorrelation statistics, local Moran's I, Anselin LISA |
| Correlati≠ | 4 | 6 |
| Sintesi≠ | Geary's C is a global spatial autocorrelation statistic that measures whether nearby areal units share similar attribute values. Unlike Moran's I, it focuses on squared differences between adjacent pairs rather than cross-products of deviations from the mean, making it more sensitive to local dissimilarity and less influenced by global trends. | LISA, introduced by Luc Anselin in 1995, decomposes a global spatial autocorrelation index into a location-specific statistic for every observation. It identifies where statistically significant spatial clusters and outliers occur on a map, enabling researchers to move beyond a single global summary and pinpoint the geographic sources of spatial dependence. |
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