

   OOrrddiinnaatteess ffoorr PPrroobbaabbiilliittyy PPlloottttiinngg

        ppoints(n)

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

          n: either the number of points generate or a vector
             of observations.

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

        This generates the sequence of points `(1:m - 0.5)/m'
        where `m' is either `n', if `length(n)==1', or
        `length(n)'.  It is used in `qqplot', `qqnorm' to gen-
        erate the set of probabilities at which to evaluate the
        inverse distribution.

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

        `qqplot', `qqnorm'.

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

        ppoints(4)
        ppoints(10)

