

   AAuuttooccoorrrreellaattiioonn FFuunnccttiioonn

        ACF(object, maxLag, ...)

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

     object: any object from which an autocorrelation function
             can be obtained. Generally an object resulting
             from a model fit, from which residuals can be
             extracted.

     maxLag: maximum lag for which the autocorrelation should
             be calculated.

        ...: some methods for this generic require additional
             arguments.

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

        This function is generic; method functions can be writ-
        ten to handle specific classes of objects. Classes
        which already have methods for this function include:
        `gls' and  `lme'.

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

        will depend on the method function used; see the appro-
        priate documentation.

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

        Jose Pinheiro and Douglas Bates

   RReeffeerreenncceess::

        Box, G.E.P., Jenkins, G.M., and Reinsel G.C. (1994)
        "Time Series Analysis: Forecasting and Control", 3rd
        Edition, Holden-Day.

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

        `ACF.gls', `ACF.lme'

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

        ## see the method function documentation

