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From |
"Hussein, Mustafa (Mustafa Hussien)" <mhussei4@uthsc.edu> |

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

Subject |
st: RE: Using command svy glm to obtain risk ratios |

Date |
Mon, 17 Feb 2014 16:32:35 +0000 |

Hello, I am not sure why your -svy- procedure won't give eform coefficients (RRs) with the log-binomial GLM (which you are trying to run here). A better alternative to log-binomial regression for estimating RRs (or prevalence rate ratios if cross-sectional data) is a modified Poisson (Poisson w robust SEs). The log-binomial is well-known to have issues with convergence and, as you've experienced, takes forever. A Poisson model is very easy to do using -glm- or -poisson-, and with pweighted-survey data, you've got to just add the eform option (or -, irr- with poisson). Hope that helps Mustafa ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Agunwamba, Amenah A., Ph.D. [Agunwamba.Amenah@mayo.edu] Sent: Monday, February 17, 2014 9:47 AM To: statalist@hsphsun2.harvard.edu Subject: st: Using command svy glm to obtain risk ratios Hello Stata Experts, I'm attempting to obtain risk ratios using weighted survey data. I'm using a binary outcome. For a simple model, I use the following code: Svy: glm outcome predictor, fam(binomial) link(log) eform Stata then does some "thinking.....", and takes forever to finally produce a table that has only coefficients and standard errors, but not the risk ratios that I am looking for. Is there something wrong with my data or my code? How would I assess if there' something wrong with the data (eg: convergence, etc?) I believe I need to use the svy command to incorporate weighting. I was able to obtain risk ratios without the svy command, but I need to use weights. Any suggestions on different commands I could use to get the results I'm looking for? Thanks in advance, * * 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/ * * 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/

**References**:**st: Using command svy glm to obtain risk ratios***From:*"Agunwamba, Amenah A., Ph.D." <Agunwamba.Amenah@mayo.edu>

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