{* *! version 1.0.5  30apr2009}{...}
    {cmd:nbinomial(}{it:n}{cmd:,}{it:k}{cmd:,}{it:p}{cmd:)}
{p2colset 8 22 26 2}{...}
{p2col: Domain {it:n}:}1e-10 to 1e+17 (can be nonintegral){p_end}
{p2col: Domain {it:k}:}0 to 2^53-1{p_end}
{p2col: Domain {it:p}:}0 to 1 (left exclusive){p_end}
{p2col: Range:}0 to 1{p_end}
{p2col: Description:}returns the cumulative probability of the negative
	binomial distribution.  {it:n} can be nonintegral.  When {it:n}
	is an integer, {cmd:nbinomial()} 
	returns the probability of observing {it:k} or fewer failures 
	before the {it:n}th success, when the probability of a success 
	on one trial is {it:p}.{p_end}

{p2col 8 22 22 2:}The negative binomial distribution function is evaluated
using the {cmd:ibeta()} function.{p_end}
{p2colreset}{...}
