

   EExxttrraacctt CCoovvaarriiaatteess FFoorrmmuullaa

        getCovariateFormula(object)

   AArrgguummeennttss::

     object: any object from which a formula can be extracted.

   DDeessccrriippttiioonn::

        The right hand side of `formula(object)', without any
        conditioning expressions (i.e. any expressions after a
        `|' operator) is returned as a one-sided formula.

   VVaalluuee::

        a one-sided formula describing the covariates associ-
        ated with `formula(object)'.

   AAuutthhoorr((ss))::

        Jose Pinheiro and Douglas Bates

   SSeeee AAllssoo::

        `getCovariate'

   EExxaammpplleess::

        library(lme)
        getCovariateFormula(y ~ x | g)
        getCovariateFormula(y ~ x)

