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st: Proportional hazard assumption for interaction term

From   Sanam P <>
Subject   st: Proportional hazard assumption for interaction term
Date   Mon, 24 May 2010 05:43:03 -0700 (PDT)

Dear Statalisters

I was wondering if in the Cox model there is interaction between two categorical variables, when checking the proportional hazard assumption using :
"estat phtest,rank detail"  after the model, for the interaction term and the variables involved in interaction to be proportional, should all the terms involved in the interaction be insignificant? if only one of the main effects at reference value of the other variable involved in the interaction term is significant and all other terms involved in the interaction are not significant, does it mean that variable is not proportional? is the interaction proportional?
(thincat=99 is a category with missing thincat values) 
Thank you very much in advance,


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