f_gammaden.ihlp

来自「是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到」· IHLP 代码 · 共 9 行

{* 02feb2005}{...}
{phang}
{cmd:gammaden(}{it:a}{cmd:,}{it:b}{cmd:,}{it:g}{cmd:,}{it:x}{cmd:)}
	returns the probability density function of the Gamma distribution,
        where {cmd:gammaden(}{it:a}{cmd:,}1{cmd:,}0{cmd:,}{it:x}{cmd:)} =
	the probability density function for the cumulative Gamma distribution
        {cmd:gammap(}{it:a}{cmd:,}{it:x}{cmd:)}.{break}
	Here {it:a} > 0, {it:b} > 0; returns 0 unless {it:x} {ul:>} {it:g}.{p_end}