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| From | David Hoaglin <dchoaglin@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: gamma |
| Date | Mon, 15 Oct 2012 07:22:27 -0400 |
Jason, digamma() is the first derivative of the gamma function, and trigamma() is the second derivative. David Hoaglin On Mon, Oct 15, 2012 at 5:47 AM, Jason Rosenberg <RSNJAS002@myuct.ac.za> wrote: > Sorry to continue this thread, > > but I read the help function guide and help lngamma(), but I still get different results for the gamma function from that of RGui(32-bit) as in: > > I type this in stata: > di lngamma(3/4) > > and get: > .20328095 > > but in R I get gamma(3/4)=1.225417 > > I've tried digamma() and trigamma() in stata just to see and they of course also give me different results. > any advice? I am modeling equations and it would be very helpful not to jump in between R and stata > > Also I'm sure the one R is evaluating is the correct one for my purposes. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/