Spatial statistics is a recent and graphical subject that is ideally suited to implementation in S; S itself includes one spatial interpolation method, akima, and 1oess which can be used for two-dimensional smoothing, but the specialist methods of spatial statistics have been added and are given in our library spatial. The main references for spatial statistics are Ripley (1981, 1988), Diggle (1983), Upton & Fingleton (1985) and Cressie (1991). Not surprisingly, our notation is closest to that of Ripley (1981).
KeywordsCovariance Function Delaunay Triangulation Spatial Statistics Nugget Effect Trend Surface
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