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st: stcurve: why two different graphs?

To   "" <>
Subject   st: stcurve: why two different graphs?
Date   Mon, 15 Oct 2012 22:12:36 +0100 (BST)

Dear Statalisters,

unfortunately I got no answer yet, but maye now someone has an idea;-):

Stata command 

sts graph, hazard 

gives the same graph to me as

    stcox, estimate basehc(bhc)
  stcurve, hazard

I can understand that. Kaplan-Meier hazard graph = stcox null modell.

But, why don´t I get the same result, if I

    stcox var1 var2 var3 var4, basehc(bhc)
    stcurve, hazard at(var1=0 var2=0 var3=0 var4=0)


The graph is similar, but not identical. Is this not the same as above?



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