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From |
Jhilbe@aol.com |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: ST: RE: oddsrisk version 2 |

Date |
Sat, 2 Feb 2008 14:51:02 EST |

I have been asked by various StataListers to add certain options to the -oddsrisk- program that I posted to SSC in December. I have submitted the revised command and help file to Kit for re-posting. The new oddsrisk program now has -if- and -in- capabilities and allows frequency weights. This is important if one wishes to estimate odds and risk ratios directly from a 2 x 2 table. Of course, Stata has a several commands that can be used to calculate risk ratios and CIs (using Woolfe's method) from a 2x2 table; eg -csi-. The option has been added to allow users to model estimated risk ratios from both full and tabulated data. For example, given a 2x2 table of -death- (response) and -anterior- (risk factor or exposure), you would model death on anterior as: oddsrisk death anterior [fw=count] A listing of odds ratio, estimated risk ratio, and estimated 95% risk ratio CI's are displayed. If oddsrisk is used on the complete data set, the command would be oddsrisk death anterior without the need for a frequency weight of counts. Care must be taken when using -oddsrisk- to estimate relative risk ratios for a number of predictors; i.e., a risk factor and confounders. There is evidence that confidence intervals are biased. However, the bias appears to be relatively minimal and the values do not vary appreciably from CIs from a Poisson with robust SE or log-binomial. All three methods are close approximations of the risk ratio and corresponding CIs. References are given in the help file. Joseph Hilbe **************Biggest Grammy Award surprises of all time on AOL Music. (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003000000025 48) * * 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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