

   UUppddaattee aa [[GG]]LLMM MMooddeell

         update.lm( lm.obj, formula, data, weights, subset, na.action)
        update.glm(glm.obj, formula, data, weights, subset, na.action,
                   offset, family, x)

   AArrgguummeennttss::

   [g]lm.obj: result of `lm' or `glm'.

             The following arguments are all optional, and have
             the identical meaning as the arguments of `lm' or
             `glm', respectively:

    formula: a `formula' for updating the former model.

       data: the `data.frame'.

    weights: observation weights.

     subset: choose a subset of cases.

   na.action: a function. what do to with `NA's, see
             `na.action'.

     offset: see `glm'.

     family: `family' for `glm'.

          x: logical, should the `x' matrix be returned?

   DDeessccrriippttiioonn::

        .....

   VVaalluuee::

        An object of the same `class' as the original
        g`lm.obj'.

   RReeffeerreenncceess::

        The ``white book''.

   SSeeee AAllssoo::

        `update.formula', `formula',`lm',`glm'.

   EExxaammpplleess::

