

   CCoonnvveerrtt ttoo OOnnee--SSiiddeedd FFoorrmmuullaa

        asOneSidedFormula(object)

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

     object: a one-sided formula, an expression, or a character
             string.

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

        Names, expressions, and strings are converted to one-
        sided formulas. If `object' is a formula, it must be
        one-sided, in which case it is returned unaltered.

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

        a one-sided formula representing `object'

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

        Jose Pinheiro and Douglas Bates

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

        `formula'

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

        library(lme)
        asOneSidedFormula("age")
        asOneSidedFormula(~ age)

