

   TThhee IInntteerrqquuaarrttiillee RRaannggee

        IQR(x, na.rm = FALSE)

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

        This function computes interquartile range of the `x'
        values.  Note that this function computes the quartiles
        using the `quantile' function rather than following
        Tukey's recommendations.

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

        Tukey, J. W. (1977).  Exploratory Data Analysis.  Read-
        ing: Addison-Wesley.

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

        `fivenum', `range', `quantile'.

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

        data(rivers)
        IQR(rivers)

