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| Statistica Globale Gi* di Getis-Ord× | Global Moran's I× | |
|---|---|---|
| Campo | Analisi spaziale | Analisi spaziale |
| Famiglia | Regression model | Regression model |
| Anno di origine≠ | 1992 | 1950 |
| Ideatore≠ | Arthur Getis and J. Keith Ord | Patrick Alfred Pierce Moran |
| Tipo≠ | Global spatial clustering statistic | Global spatial autocorrelation test / index |
| Fonte seminale≠ | Getis, A., & Ord, J. K. (1992). The analysis of spatial association by use of distance statistics. Geographical Analysis, 24(3), 189-206. DOI ↗ | Moran, P. A. P. (1950). Notes on continuous stochastic phenomena. Biometrika, 37(1/2), 17–23. DOI ↗ |
| Alias | Global G statistic, Getis-Ord General G, General G*, Global spatial clustering statistic | Moran's I, global spatial autocorrelation index, Moran index, GMI |
| Correlati≠ | 5 | 6 |
| Sintesi≠ | The Global Getis-Ord Gi* statistic measures the overall degree of spatial clustering of high or low values across an entire study region. It answers whether the study area, taken as a whole, exhibits significant concentration of high values (hot clustering) or low values (cold clustering), returning a single summary Z-score for the entire dataset. | Global Moran's I is the most widely used single-number summary of spatial autocorrelation across an entire study area. It compares the attribute value at each location with values at neighbouring locations using a spatial weights matrix, and returns a statistic ranging from −1 (perfect dispersion) through 0 (spatial randomness) to +1 (perfect clustering). A significance test determines whether the observed pattern is stronger than random chance. |
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