Algorithm 310.  Source code for many
      Applied Statistics Algorithms is available through
      <a href = "http://lib.stat.cmu.edu/apstat">STATLIB</a>.
    </p>

    <hr>

    <p>
      <b>
        Warning:
      </b>
      <i>
        I could not get this algorithm to perform properly until
        I had made a number of corrections.
      </i>
    </p>

    <p>
      <i>
        Note that the printed text of the algorithm, and the online version
        distributed by APSTAT, omit a crucial initializa