https://communities.sas.com/t5/Statistical-Procedures/Rate-question/m-p/533189#M26860 <P>Hi all! I have a dataset of a retrospective matched cohort study of cases and controls together. I am interested to know if a lookback injury rate before an index date into study, can be used as a predictor variable for a time to first injury Cox model post-index date. I was thinking of doing a number of events divided by person years sort of idea. Can someone offer their insights on this? Also if you can show me the code for doing this, I would be very grateful!</P> Wed, 06 Feb 2019 11:36:02 GMT curiosgeorge 2019-02-06T11:36:02Z https://communities.sas.com/t5/Statistical-Procedures/Rate-question/m-p/533189#M26860 <P>Hi all! I have a dataset of a retrospective matched cohort study of cases and controls together. I am interested to know if a lookback injury rate before an index date into study, can be used as a predictor variable for a time to first injury Cox model post-index date. I was thinking of doing a number of events divided by person years sort of idea. Can someone offer their insights on this? Also if you can show me the code for doing this, I would be very grateful!</P> Wed, 06 Feb 2019 11:36:02 GMT https://communities.sas.com/t5/Statistical-Procedures/Rate-question/m-p/533189#M26860 curiosgeorge 2019-02-06T11:36:02Z