SAAP, Spatial Autocorrelation Analysis Program, Version 4.3

Spatial autocorrelation statistics are used to describe the relationships between data observed at different geographic locations. SAAP is an interactive graphics-based program for geographical variation, spatial pattern, and other geographical analyses. It calculates two indices of spatial autocorrelation, Moran’s I and Geary’s c, and their statistical significances. It accepts only interval data, calculates either Euclidean or spherical distances between localities, and provides both data summaries and on-screen correlogram plots.

This program incorporates data editing/handling features and includes geographic EDA methodology. It provides graphic display of the data distribution, a locality map, interactive data editing, data transformation, EDA summaries, correlogram plots, and on-line help. SAAP can analyze data with up to 400 localities and up to 25 variables using as many as 25 correlogram classes. While this DOS program has not been updated in several years, many still find it useful.

There are 6 plotting options, including the cumulative frequency distribution and geographic map of the geographic weights used in calculating the autocorrelation statistics. Users can highlight selected localities, zoom in on the map and insert/delete data points by using the function keys. Other plots include the raw data values, locality-wise contributions to the autocorrelation statistics, and the geographic connections map.

Requirements: IBM PC compatible, DOS 3.3+, 512K RAM, and an EGA or VGA graphics adapter.

Cost: $125

Note: while this is an old DOS program, it is still listed because some find it useful.

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