

   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)

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

        This function computes interquartile range of the data
        values in its arguments.  Note that this function com-
        pute the quartiles using the function `quantile' 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)

