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st: Question regarding Gamma distribution and its implementation


From   tiago.pereira@incor.usp.br
To   statalist@hsphsun2.harvard.edu
Subject   st: Question regarding Gamma distribution and its implementation
Date   Fri, 29 Sep 2006 15:35:04 -0300 (BRT)

Dear all,

I´m geneticist. Hence, sorry for the dummy questions.

I have to generate a new variable using a set of parameters.

The new variable is generated as follows:

((z^y)/(gamma(y,z)))* integral of x^y-1 * exp^-zx dx from c to infinity,
where

z, y, c  are values previously calculated

gamma is the Gamma distribution with parameters y and z.

How do I implement such formula using Stata?

I have already checked "functions" commands, but still feel unsure
regarding the correct implementation.

I´ll be glad for any help. Thanks in advance.



Tiago


-- 
Tiago V. Pereira
Heart Institute - InCor
Laboratory of Cardiovascular Genetics
Federal University of São Paulo
University of São Paulo Medical School
Av. Dr. Eneas de Carvalho Aguiar, 44;
Cerqueira César - CEP 05403-000
Sao Paulo, SP Brazil.
Tel./fax: +55 11 3069 5068
email:  tiago.pereira@incor.usp.br



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