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W. N. Venables and B. D. Ripley. Modern Applied Statistics with S , 4th edition lm(z ~ x*y), image(), persp(). loess(z~x*y). interp() RHS: more partial derivs. library(spatial), correlogram(), variogram(). library(spatial), correlogram(), surf.gls(). surf.gls().
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W. N. Venables and B. D. Ripley. Modern Applied Statistics with S, 4th edition lm(z ~ x*y), image(), persp()