R: Dimensions of a corSpatial Object

Dimensions of a corSpatial Object

Dim(object, groups)

`object`	an object inheriting from class `corSpatial`, representing a spatial correlation structure.
`groups`	an optional factor defining the grouping of the observations; observations within a group are correlated and observations in different groups are uncorrelated.

if groups is missing, it returns the Dim attribute of object; otherwise, calculates the dimensions associated with the grouping factor.

a list with components:

`N`	length of `groups`
`M`	number of groups
`spClass`	an integer representing the spatial correlation class; 0 = user defined class, 1 = `corSpher`, 2 = `corExp`, 3 = `corGaus`, 4 = `corLin`
`sumLenSq`	sum of the squares of the number of observations per group
`len`	an integer vector with the number of observations per group
`start`	an integer vector with the starting position for the distance vectors in each group, beginning from zero

Jose Pinheiro and Douglas Bates

library(lme)
data(Orthodont)
Dim(corGaus(), getGroups(Orthodont))