ABSTRACT
The use of exploratory data analysis techniques on spatial data involves the computation and presentation of measures of global and/or local spatial dependence. A range of global or general measures, including Moran's /, Geary's C, specified by contiguity defined in a number of ways, and semi-variogram statistics, specified by distance and direction, may be calculated. These however need to be completed with observations of local indicators and/or distance statistics (Anselin, 1995; Ord and Getis, 1995). These are also termed focused tests. The presence of global dependence may mask local effects in the spatial data generation process.
