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st: dtobit


From   [email protected]
To   [email protected]
Subject   st: dtobit
Date   Thu, 6 Mar 2008 10:25:51 -0000 (GMT)

Dear Statlist,

I am using a tobit model to estimate an Engel curve. And after that I am
using the dtobit command to get the marginal effects (i am using stata
10). I am a bit of confused about the results that I find.
One of my regressors is log of income, do I need to add a special
specification to dtobit to get the correct marginal effect?
When I run a probit of the same model (I just change my LHS variable to a
binary choice - expenditure or not) and I then do an mfx, I don't get the
same result as the "marginal effect - probability uncensored" and I was
wondering why that was?

I will be very appreciative of your help because this is for my final year
project and if I can't interpret the result, I will look a bit like an
idiot...

Thank you in advance

Regards,

Camille
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