spatial library from Venables & Ripley (4th edition)
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Kriging
=======

correlogram
variogram
expcov, gaucov, sphercov   covariance functions
surf.ls			LS trend surface
surf.gls		GLS trend surface
trmat			evaluate trend surface
prmat			kriged surface
semat			s.e. of prediction
anova.trls              anova tables for fitted trend surface objects
predict.trls            predict method for trend surface fits
trls.influence          regression diagnostics for trend surfaces


Point Patterns
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ppinit			initialize from datafile
ppregion		set region
Kfn			evaluate Kfn
Kenvl			form envelopes
Kaver			form average
Psim			Poisson/binomial simulation
SSI			Sequential inhibition process simulation
Strauss			Strauss process simulation
pplik			pseudo-likelihood estimation for Strauss process
