Hello,

How does one interpret the subscript on a gamma function? For example, in the two parameter Gamma Cumulative Distribution Function:

$\displaystyle F(x)=\frac{\Gamma_{\frac{x}{\beta}}(\alpha)} {\Gamma {(\alpha)} }$

What does the subscript $\displaystyle \frac{x}{\beta}$ mean in terms of how I should evaluate the gamma function.

Thanks