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From |
Ronan Conroy <rconroy@rcsi.ie> |

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

Subject |
Re: st: Negative binomial regression and Incident rate ratio(IRR) |

Date |
Wed, 2 Sep 2009 11:13:30 +0100 |

On 1 MFómh 2009, at 11:22, Muhammad Riaz wrote:

Dear All,I am trying to fit a model for count data using Negative binomialregression, it gives incident rate ratios for the variables in themodel, one of the options for this type of model is specifying theoffset variable while fitting the model in stata using glm. Thisoffset should be the person years (if i am correct). however I donot have data on this variable. My question is:Is it correct to fit the model without an offset and would theIncident rate ratio be still correct to report If I do not specifythe offset variable in the model?

I will really appreciate any help. Thank you, M Riaz * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

Ronan Conroy ================================= rconroy@rcsi.ie Royal College of Surgeons in Ireland Epidemiology Department, Beaux Lane House, Dublin 2, Ireland +353 (0)1 402 2431 +353 (0)87 799 97 95 +353 (0)1 402 2764 (Fax - remember them?) http://rcsi.academia.edu/RonanConroy P Before printing, think about the environment * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Negative binomial regression and Incident rate ratio(IRR)***From:*Muhammad Riaz <citriaz@yahoo.com>

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