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st: non-linearities in ml

From   Ishani Tewari <>
To   statalist <>
Subject   st: non-linearities in ml
Date   Tue, 30 Jul 2013 22:21:48 -0400

Dear all,
I need to estimate a logit where the parameters (beta1,beta2,beta3)
enter very non-linearly:.

lnf=ln(invlogit((X1^beta1')*(`beta2*X2+`beta3'*log(`beta3'/X1)))) if y1==1
lnf=ln(invlogit(-(X1^beta1')*(`beta2*X2+`beta3'*log(`beta3'/X1)))) if y1==0

Can I (should I) still use the "lf" model?

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