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st: Command "margin" after Cox Regression

From   Yuval Arbel <>
Subject   st: Command "margin" after Cox Regression
Date   Wed, 26 Oct 2011 01:28:37 +0200

Dear Statalist Users,

I'm trying to run the following command after the Cox Regression:

. margins, at(max_red=20) atmeans predict(basesurv)

I'm getting the following error note:

prediction is a function of possibly stochastic quantities other than e(b)

On the other hand, when I'm running:

 predict a1,basesurv
(8405 missing values generated)

The command works fine.

My question is what is the problem with the command "margins"?

Dr. Yuval Arbel
School of Business
Carmel Academic Center
4 Shaar Palmer Street, Haifa, Israel
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