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st: RE: Command "margin" after Cox Regression


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Command "margin" after Cox Regression
Date   Wed, 26 Oct 2011 00:38:57 +0100

The problem with -margins- is likely to be that you are asking a question that it cannot answer. 

So, people who know about this kind of thing will want to see what you typed before as your -stcox- command. 

Nick 
n.j.cox@durham.ac.uk 

Yuval Arbel

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)
r(498);

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"?

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