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| Autocorrelazione spaziale robusta× | Geary's C× | |
|---|---|---|
| Campo | Analisi spaziale | Analisi spaziale |
| Famiglia | Regression model | Regression model |
| Anno di origine≠ | 1981–1995 | 1954 |
| Ideatore≠ | Cliff & Ord; extended by Anselin and colleagues | Roy C. Geary |
| Tipo≠ | Spatial dependence test (robust variant) | Spatial autocorrelation statistic |
| Fonte seminale≠ | Anselin, L., & Florax, R. J. G. M. (1995). Small sample properties of tests for spatial dependence in regression models: some further results. In Anselin, L. & Florax, R. J. G. M. (Eds.), New Directions in Spatial Econometrics. Springer, Berlin. link ↗ | Geary, R. C. (1954). The Contiguity Ratio and Statistical Mapping. The Incorporated Statistician, 5(3), 115–145. link ↗ |
| Alias | robust Moran's I, robust spatial dependence test, outlier-resistant spatial autocorrelation, RSA | Geary contiguity ratio, Geary C statistic, spatial contiguity ratio, Geary's c |
| Correlati≠ | 5 | 4 |
| Sintesi≠ | Robust spatial autocorrelation methods measure the degree to which nearby geographic units share similar values, while explicitly controlling for the distorting influence of spatial outliers and extreme observations. They extend classical statistics such as Moran's I by down-weighting or trimming observations that would otherwise inflate or deflate the autocorrelation signal. | 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. |
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