Hi there, My ultimate goal is to produce a plot of effect sizes associated with the treatment across a range of models. I am translating all results into relative risks with 95% confidence intervals. When you run a duration dependent model using the exponential survival distribution and obtain hazard ratios, have you thus obtained the quantity of interest? Using Zelig in the Logit framework, for example, I set values of X and ran simulation to obtain relative risks. But in the survival framework, it appears that simply through regression, you obtain the analogous quantity. Is there any benefit in using Zelig to run simulations in this case? Best Regards, Andy Stokes Institute for Health Metrics and Evaluation - Zelig Mailing List, served by Harvard-MIT Data Center Send messages: zelig(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=zelig Zelig program information: http://gking.harvard.edu/zelig/