imits on the Frequency of Occurrence for the Negative Binomial Distribution">See
          negative binomial confidence interval example.</a>
        </p>
<p>
          This function uses the Clopper-Pearson method of computing the lower bound
          on the success fraction, whilst many texts refer to this method as giving
          an "exact" result in practice it produces an interval that guarantees
          <span class="emphasis"><em>at least</em></span> the coverage required, and may produce pessimi