selectstat()
is used to select sites on a graphic such
as Histogram, Barplot, Boxplot, Polyboxplot, Scatterplot, Densityplot, Neighbourplot, Lorentz,
Moran, Angleplot, Variocloud, Cluster, or PCA. Most of the GeoXp functions call selectstat.r.
selectstat(var1, var2, obs, Xpoly, Ypoly, method,
nbcol, W, F, long, lat)