RE: covariate selection question

From: Leonid Gibiansky leonidg@metrumrg.com Subject: RE: [NMusers] covariate selection question Date: Fri, 20 Jan 2006 13:59:57 -0500 Just to pick on the word: "Interestingly, even when we have done simulation studies, we sometimes find that the optimal model is not the one used for the simulation, due to random variation, a better model exists." ------ You cannot find better model than the true one (the one that was used for simulations). If you was not able to get it, this either mean that the study design (population selection/sample size in case of the covariate model) cannot support the model or the design has no power to separate very similar models. Leonid