Dim.corStruct {nlme}R Documentation

Dimensions of a corStruct 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 class 'corStruct':
Dim(object, groups, ...)

Arguments

object an object inheriting from class corStruct, representing a 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.
... some methods for this generic require additional arguments. None are used in this method.

Value

a list with components:

N length of groups
M number of groups
maxLen maximum number of observations in a group
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 observations in each group, beginning from zero

Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

See Also

Dim, Dim.corSpatial

Examples

Dim(corAR1(), getGroups(Orthodont))

[Package nlme version 3.1-80 Index]