nlme (version 3.1-166)

Dim.corSpatial: Dimensions of a corSpatial Object

Description

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

Usage

# S3 method for corSpatial
Dim(object, groups, ...)

Value

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

Arguments

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.

...

further arguments to be passed to or from methods.

Author

José Pinheiro and Douglas Bates

See Also

Dim, Dim.corStruct

Examples

Dim(corGaus(), getGroups(Orthodont))

cs1ARMA <- corARMA(0.4, form = ~ 1 | Subject, q = 1)
cs1ARMA <- Initialize(cs1ARMA, data = Orthodont)
Dim(cs1ARMA)