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| Ο Στατιστικός Δείκτης Global Getis-Ord Gi*× | Χωρική Αυτοσυσχέτιση× | |
|---|---|---|
| Πεδίο | Χωρική Ανάλυση | Χωρική Ανάλυση |
| Οικογένεια | Regression model | Regression model |
| Έτος προέλευσης≠ | 1992 | 1950 |
| Δημιουργός≠ | Arthur Getis and J. Keith Ord | P. A. P. Moran (global measure, 1950); Roy Geary (Geary's C, 1954); Luc Anselin (LISA, 1995) |
| Τύπος≠ | Global spatial clustering statistic | Spatial statistic / exploratory spatial data analysis |
| Θεμελιώδης πηγή≠ | 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 ↗ |
| Εναλλακτικές ονομασίες | Global G statistic, Getis-Ord General G, General G*, Global spatial clustering statistic | spatial dependence, geographic autocorrelation, spatial clustering measure, SA |
| Συναφείς | 5 | 5 |
| Σύνοψη≠ | 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. | Spatial autocorrelation quantifies the degree to which a variable's values at nearby locations resemble each other more (positive autocorrelation) or less (negative autocorrelation) than expected by chance. Global indices such as Moran's I summarise the pattern across the entire study area, while local variants reveal clusters and outliers at the level of individual observations. |
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