jack webster wrote:
hello, I need a good estimator for the Correlogram, under 2nd stationary condition, and a SPLUS program for computing it (if there is). Sincerely: Webster
Jack, you can use the S-Plus function acf() to compute autocorrelations from one-dimensional data. As you're on this list, you probably want it for 2-D or 3-D. For those data you can compute variograms.
In S-Plus, library gstat (free; www.gstat.org) or the S-Plus SpatialStats module (commercial) are available for computing sample variograms and modelling variogram functions.
The correlogram can be computed from a variogram by
r(h) = (C0-gamma(h))/C0
with C0 the sill of the variogram and gamma(h) the semivariance (model) value. -- Edzer
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