[ADMB Users] inv_cumd_gamma parameters
Mollie Brooks
mbrooks at ufl.edu
Tue Jan 18 17:24:29 PST 2011
Hi,
I'm guessing Hans is the best person to ask, but I thought this could
benefit others as well.
I'm having trouble relating inv_cumd_gamma() to the gamma distribution
I know which has 2 parameters. I've seen the example at
http://otter-rsch.com/admbre/examples/gamma/gamma.html
which uses it as follows:
theta*inv_cumd_gamma(z, 1/theta)
If z is an observation of the cumulative density, and inv_cumd_gamma
should map z back to the gamma distribution, then I'm wondering why
the gamma distribution only has one parameter. Do I need to do another
transformation to get k in there?
thanks,
Mollie
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