Talk:Documentation/How Tos/Calc: GAMMADIST function

The description follows the ODFF draft spec, but OOo (and Excel and Gnumeric) calculate different. They use the third parameter 'beta' as scale parameter.

The density function in OOo is calculated as

${\frac {({\frac {x}{\beta }})^{\alpha -1}e^{-{\frac {x}{\beta }}}}{\beta \,\Gamma (\alpha )}}$

Regina 23:24, 26 September 2008 (CEST)

Thank you! Non-italising e as you suggested:

${\frac {({\frac {x}{\beta }})^{\alpha -1}{\mbox{e}}^{-{\frac {x}{\beta }}}}{\beta \,\Gamma (\alpha )}}$

and the cumulative fn:

$\int _{0}^{x}{\frac {({\frac {t}{\beta }})^{\alpha -1}{\mbox{e}}^{-{\frac {t}{\beta }}}}{\beta \,\Gamma (\alpha )}}{\mbox{d}}t$

Is that OK?

drking 08:00, 27 September 2008 (GMT)