As described in ArcGIS 10.2, the OHS analysis is a tool that uses the Getis-Ord Gi * statistic [Eq. (4)] to estimate the associated Z-score for each feature. To aggregate the Z-scores, OHS applies the average and the median nearest-neighbor calculations given incremental distances between observations as estimated using the incremental spatial autocorrelation tool. In the Getis-Ord Gi * statistic, xjis the attribute value for the feature under consideration for observation j, wi, j represents the spatial weights between observations, n is the total number of observations, X is equal to ? j = 1 n x j n , and S is equivalent to ? j = 1 n x j 2 n – ( X ) 2 .
To choose spatial loads representing spatial relationship ranging from observations and you may between attributes of notice (Anselin, 1988; Getis and you may Aldstadt, 2004; Getis, 2009), we used the geo-referenced investigation-latitude and you can longitude out-of ranch and you may hold coordinates-accumulated into the occupation survey and you can observed a row-standard inverse range spatial loads matrix. Continue reading