corSpatial  R Documentation 
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.
corSpatial(value, form, nugget, type, metric, fixed)
value 
an optional vector with the parameter values in
constrained form. If 
form 
a one sided formula of the form 
nugget 
an optional logical value indicating whether a nugget
effect is present. Defaults to 
type 
an optional character string specifying the desired type of
correlation structure. Available types include 
metric 
an optional character string specifying the distance
metric to be used. The currently available options are

fixed 
an optional logical value indicating whether the
coefficients should be allowed to vary in the optimization, or kept
fixed at their initial value. Defaults to 
an object of class determined by the type
argument and also
inheriting from class corSpatial
, representing a spatial
correlation structure.
JosÃ© Pinheiro and Douglas Bates bates@stat.wisc.edu
Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons.
Venables, W.N. and Ripley, B.D. (2002) "Modern Applied Statistics with S", 4th Edition, SpringerVerlag.
Littel, Milliken, Stroup, and Wolfinger (1996) "SAS Systems for Mixed Models", SAS Institute.
corExp
,
corGaus
,
corLin
,
corRatio
,
corSpher
,
Initialize.corStruct
,
summary.corStruct
,
dist
sp1 < corSpatial(form = ~ x + y + z, type = "g", metric = "man")
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