Dim.corSpatial {nlme} | R Documentation

## 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 class 'corSpatial':
    Dim(object, groups, ...)

### 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.

### 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

### Author(s)

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

### See Also

`Dim`, `Dim.corStruct`

### Examples

    Dim(corGaus(), getGroups(Orthodont))

[Package nlme version 3.1-73 Index]