This function is a constructor for the corSpatial class,
representing a spatial correlation structure. This class is "virtual",
having four "real" classes, corresponding to specific spatial
correlation structures, associated with it: corExp,
corGaus, corLin, corRatio, and
corSpher. The returned object will inherit from one of these
"real" classes, determined by the type argument, and from the
"virtual" corSpatial class. Objects created using this
constructor must later be initialized using the appropriate
Initialize method.
an object of class determined by the type argument and also
inheriting from class corSpatial, representing a spatial
correlation structure.
References
Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons.
Venables, W.N. and Ripley, B.D. (1997) "Modern Applied Statistics with
S-plus", 2nd Edition, Springer-Verlag.
Littel, Milliken, Stroup, and Wolfinger (1996) "SAS Systems for Mixed
Models", SAS Institute.