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st: Cox multilevel

From   Celine Genty <>
Subject   st: Cox multilevel
Date   Tue, 16 Nov 2010 16:34:34 +0100


I am trying to make a multilevel model of survival data, so with the -shared()- option.

I have about 5000 patients included by 300 center.

But 45 center have only 1 patient (with a median of 7 patients per center IQR 3-21).

Is multilevel model appropriate in this case ? Is there too much center ? Is there too much center with only 1 patient ?

Thank you very much.

Best regards.

Céline GENTY

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