Can you fit a single model that includes the two classifiers from which the model with one classifier could be obtained as a special case? If yes (and if neither parameter was at a boundary crudely similar to a zero variance component in "lme"), then you could use the theory that 2*ln(likelihood ratio) is approximately chi-square. For many capabilities in R, this is implemented as a function anova(fit2, fit1) where fit2 and fit1 are the results of fitting the general and the specialized models.
If you don't see how to make this work, PLEASE do read the posting guide! "http://www.R-project.org/posting-guide.html". It might help you find a better answer. Failing that, if you submit another post after following the process described therein, it should increase the chances that you will get a useful reply. spencer graves Steve Adams wrote: > Hi, > > Is there a R test available that tests whether 2 > hazard ratios obtained from Cox regressions on the > same patient sample by 2 different classifiers are > significantly different? > > Thanks > > Steve > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- Spencer Graves, PhD Senior Development Engineer PDF Solutions, Inc. 333 West San Carlos Street Suite 700 San Jose, CA 95110, USA [EMAIL PROTECTED] www.pdf.com <http://www.pdf.com> Tel: 408-938-4420 Fax: 408-280-7915 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html