

   SSttaannddaarrdd DDeevviiaattiioonn

        sd(x, na.rm = FALSE)

   DDeessccrriippttiioonn::

        This function computes the standard deviation of the
        values in `x'.  If `na.rm' is `TRUE' then missing val-
        ues are removed before computation proceeds.

   SSeeee AAllssoo::

        `var' for its square, and `mad', the most robust alter-
        native.

   EExxaammpplleess::

        sd(1:2) ^ 2

