GS⁺ Madograms

Madograms are similar to traditional variograms except that the absolute difference between values at different sample locations is used rather than the square of the difference as for traditional semivariance. Different anisotropic directions appear on separate tabs.  Parameters for calculating madograms are set in the Autocorrelation Window.
 

When the program is running, placing the mouse cursor over a madogram point will produce a box showing the number of pairs in that lag class interval, and clicking on the point will produce a Variance Cloud or h-Scattergram graph of all pairs in that interval.

Other measures of autocorrelation provided by GS+ include variograms, correlograms, rodograms, covariograms, drift, Moran’s I, fractal dimension, and standardized, general relative, and pairwise relative variograms.