getCovariate.data.frame         package:nlme         R Documentation

Extract Data Frame Covariate

Description:

     The right hand side of 'form', stripped of any conditioning
     expression (i.e. an expression following a '|' operator), is
     evaluated in 'object'.

Usage:

     ## S3 method for class 'data.frame':
     getCovariate(object, form, data)

Arguments:

  object: an object inheriting from class 'data.frame'.

    form: an optional formula specifying the covariate to be evaluated
          in 'object'. Defaults to 'formula(object)'.

    data: some methods for this generic require a separate data frame.
          Not used in this method.

Value:

     the value of the right hand side of 'form', stripped of any
     conditional expression, evaluated in 'object'.

Author(s):

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

See Also:

     'getCovariateFormula'

Examples:

     getCovariate(Orthodont)

