Re: cox-regression SPSS 20 "no-events-problem"

Posted by Andy W on Mar 18, 2013; 5:39pm
URL: http://spssx-discussion.165.s1.nabble.com/cox-regression-SPSS-20-no-events-problem-tp5718800p5718809.html

Hopefully you get more actionable advice than this, but I know this is referred to as perfect seperation when it occurs in logistic regression. Some quick googling brings up this citation for Cox regression, http://www.jstor.org/stable/2676848, and the same author has SAS and SPlus functions to estimate the models, http://cemsiis.meduniwien.ac.at/fileadmin/msi_akim/CeMSIIS/KB/volltexte/Heinze_Ploner_2002_CompMethProgBiom.pdf.

Congrats on the successful experiment, and hopefully your reviewers are not so curmudgeonly to accept such obvious results at face value. I was thinking you could just plot the confidence interval for the predicted hazard function for the non-treated group to show the variability in the estimates, but others on this list-serve can probably give you better advice than that.