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From |
"Leda Inga" <ledainga@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Converting an odds ratio in a risk ratio - Logit |

Date |
Sat, 14 Jun 2008 19:54:22 -0500 |

Dear statalisters: I ran a logit with diferent dummies as you can see below: Y = f(X, D1_3, D4, D5, .., D10, D_more10) X: set of regressors D_: dummies that classify each indiviual by the number of visits made to the doctor. Since I ran a fixed effect logit, I only can get the odds ratio of each dummy. Nevertheless, I would like to convert them in risk ratios. I hope that someone has any idea or has been in a similar situation before. According to the recomendation of Jun Zhang and Kai F. Yu (http://jama.ama-assn.org/cgi/content/full/280/19/1690#ACK) it can be used the following: RR= OR/ (1 - Po + Po*OR) where Po is the incidence of Y in the "unexposed group". Since I used diferent dummies, I'm not sure what should be my "unexposed group" for each dummy. I know that the coefficient of each dummy must be interpreted versus the reference group (in my case, zero visits). But maybe to get the risk ratios of "X" visits versus the reference (zero visits) the unexposed group should be "X-1" visits or all but "X" (since each dummy takes values of zero for all individuals who didn't have "X" visits) Any help would be really appreciated. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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