nlme (version 3.1-86)

getGroups.corStruct: Extract corStruct Groups

Description

This method function extracts the grouping factor associated with object, if any is present.

Usage

## S3 method for class 'corStruct':
getGroups(object, form, level, data, sep)

Value

if a grouping factor is present in the correlation structure represented by object, the function returns the corresponding factor vector; else the function returns NULL.

See Also

getGroups

Examples

cs1 <- corAR1(form = ~ 1 | Subject)
getGroups(cs1, data = Orthodont)