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

Posted by David Marso on Mar 18, 2013; 6:17pm
URL: http://spssx-discussion.165.s1.nabble.com/cox-regression-SPSS-20-no-events-problem-tp5718800p5718814.html

Perusing the paper Andy cites leads to initial optimism.

"The core routines of both programs reside in
a dynamic link library (DLL) and can thus also
be accessed from other software packages. "

YAY!  Bring on the snakeheads !

This hope soon dispelled by the apparent unavailability of the URL cited in the paper ;-(
Might just be my system so give it a whirl.
--
Technical Report [4] which is available along with the programs at the WWW location
http://www.akh-wien.ac.at/imc/biometrie/fc

Blah blah blah...
I hate it when that happens ;-((
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Andy W wrote

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.