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From |
jhilbe@aol.com |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: RE: Poisson Regression |

Date |
Tue, 15 Feb 2011 11:28:51 -0500 (EST) |

Joseph Hilbe Date: Mon, 14 Feb 2011 17:15:05 -0200 From: _Maria_Pacheco_de_Souza?= <jmpsouza@usp.br> Subject: st: RES: RE: Poisson Regression Dear Alexandra and Paul: The user written -oddsrisk- by Joseph M. Hilbe, Arizona State University - ---- Hilbe@asu.edu; jhilbe@aol.com may be a good approach: "Conversion from Logistic Odds Ratios to Risk Ratios

the risk factor or exposure..." Jos? Maria Pacheco de Souza Professor Titular, aposentado; Colaborador S?nior

Av. Dr. Arnaldo, 715 - S?o Paulo, Capital - cep 01246-904 Fones: FSP= (11)3061-7747 Res= (11)3714-2403; (11)3768-8612 www.fsp.usp.br/~jmpsouza Alexandra,

In general, two approaches are suggested: log-binomial and Poisson regression with robust standard errors. The log-binomial approach is preferred, unless the model fails to converge (which if frequently does)

- -binreg-, with the rr option. I think that Poisson regression with robust standard errors (the robust

is common.

logistic regression not be used for risk or prevalence ratios when the outcome is common. *************

differences. Am J Epidemiol. Jan 1986;123(1):174-184. Skov T, Deddens J, Petersen MR, Endahl L. Prevalence proportion ratios:

studies and clinical trials of common outcomes. Am J Epidemiol. May 15 2003;157(10):940-943.

common outcomes. JAMA. Aug 11 1999;282(6):529.

binary data. American Journal of Epidemiology. 2004;159:702-706. Barros AJ, Hirakata VN. Alternatives for logistic regression in cross-sectional studies: an empirical comparison of models that directly estimate the prevalence ratio. BMC Med Res Methodol. Oct 20 2003;3:21.

Environ Med. Jul 2008;65(7):481, 501-486. Petersen MR, Deddens JA. A comparison of two methods for estimating prevalence ratios. BMC Med Res Methodol. 2008;8:9. Spiegelman D, Hertzmark E. Easy SAS calculateons for risk or prevalence ratios and differences. Am J Epidemiol. Aug 1 2005;162(3):199-200. Paul F. Visintainer, PhD Baystate Medical Center Springfield, MA 01199 * * 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/

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