is Applied Statistics Algorithm 226.  Source code for many
      Applied Statistics Algorithms is available through
      <a href = "http://lib.stat.cmu.edu/apstat">STATLIB</a>.
    </p>

    <p>
      The program can produce reasonably accurate answers for values
      of the noncentrality parameter up to about 100.
    </p>

    <p>
      <i>
        Note that an improvement to <b>ASA226</b> was suggested by Frick,
        and implemented in the online copy available through STATLIB.
        When I run th