lso called
          the Polya Distribution.
        </p>
<p>
          The Poisson distribution is a generalization of the Pascal distribution,
          where the success parameter r is an integer: to obtain the Pascal distribution
          you must ensure that an integer value is provided for r, and take integer
          values (floor or ceiling) from functions that return a number of successes.
        </p>
<p>
          For large values of r (successes), the negative binomial distribution converges
 