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st: overall test of interaction

From   Grethe Søndergaard <>
Subject   st: overall test of interaction
Date   Mon, 15 Nov 2010 13:34:15 +0100

Dear list,

I am analysing my data using a stratyfied cox-regression analysis
Since I want to examine if any interaction occurs between education
and birthyear, I have inserted an interaction-term:

stcox i.birthyear,
strata(group-id) vce(cluster person-id)

Is it possible for me to do an overall test in order to see, if the
interaction is significant? Since I am using vce(cluster), I cannot do
a lrtest of a model with and without the interaction term...

Best regards Grethe
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