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From |
"Guillermo A. Sandoval (UofT)" <guillermo.sandoval@mail.utoronto.ca> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
st: gamma family - alpha and theta parameters - xtgee |

Date |
Tue, 28 May 2013 23:36:31 +0000 |

Dear I am using xtgee with gamma distribution. I understand that for gamma distribution, one needs to define the parameters alpha and theta, which define the shape of the distribution function. Please see http://en.wikipedia.org/wiki/Gamma_distribution. My variable is continuous (mortality rates in hospitals) and distributes pretty much like the one in wekipedia that says k=1 and theta=2. In xtgee, it looks like one cannot define these parameters. I guess my question is, is this necessary (if yes, how)? or xtgee actually estimates them and I don't really need to worry about that? Thanks in advance Guillermo ---- Guillermo A. Sandoval PhD Candidate in Health Services Research Institute of Health Policy, Management and Evaluation University of Toronto * * 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/

**Follow-Ups**:**st: RE: gamma family - alpha and theta parameters - xtgee***From:*"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>

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