</p>
                  <p>
                    Implementation is in terms of <a class="link" href="../../sf_beta/beta_derivative.html" title="Derivative of the Incomplete Beta Function">ibeta_derivative</a>:
                  </p>
                  <p>
                    (p/(r + k)) * ibeta_derivative(r, static_cast&lt;RealType&gt;(k+1),
                    p) The function <a class="link" href="../../sf_beta/beta_derivative.html" title="Derivative of the Incomplete Beta Function">ibeta_derivative</a>
     