[R] Re : Re : How to compare the effect of a variable across regression models?

help list r-help@r-project.org Envoyé le : Ven 13 août 2010, 15h 50min 18s Objet : Re: [R] How to compare the effect of a variable across regression models? David, In the Cox and many other regression models, the effect of a variable is context-dependent. There is an identifiability problem

Re: [R] Re : Re : How to compare the effect of a variable across regression models?

. _ De : Bert Gunter gunter.ber...@gene.com À : Biau David djmb...@yahoo.fr Cc : Frank Harrell f.harr...@vanderbilt.edu; r help list r-help@r-project.org Envoyé le : Ven 13 août 2010, 18h 22min 58s Objet : Re: [R] Re : How to compare the effect of a variable across regression models

Re: [R] Re : Re : How to compare the effect of a variable across regression models?

22min 58s Objet : Re: [R] Re : How to compare the effect of a variable across regression models? Just to amplify a bit on what Frank said... Except in special circumstances (othogonal designs, say), regression models are only guaranteed to produce useful predictions -- they may not tell you