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st: tobit or anything else?

From   Berthold Hoppe <>
Subject   st: tobit or anything else?
Date   Sat, 12 Apr 2008 09:48:00 +0200

Dear Statalist users!

I try to analyze the relation between two continuous biological markers (y, x) in a study population, where -y- depends on -x-. Other data indicate that this relation is significantly influenced by a genotype z (two outcomes: 0, 1). The hypothesis is that the regression coefficients (y, x) differ between z=0 and z=1.
As -y- in censored (due to lower detection limit of the measurements) -tobit- instead of -reg- seems to be adequate.

Would the following analysis be correct to test my hypothesis?

xi3: tobit y x@z, ll
test x@z==0 = x@z==1

Does anyone know, how to handle this question.

Have a nice weekend,

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