e Distributions. Computational statistics and data analysis, 2005,
          vol. 48, no3, 605-621</a>.
        </p>
<h6>
<a name="math_toolkit.dist_ref.dists.negative_binomial_dist.h6"></a>
          <span class="phrase"><a name="math_toolkit.dist_ref.dists.negative_binomial_dist.estimating_number_of_trials_to_e"></a></span><a class="link" href="negative_binomial_dist.html#math_toolkit.dist_ref.dists.negative_binomial_dist.estimating_number_of_trials_to_e">Estimating
          Number of Trials to Ensure at