# Re: st: How CAN I test the equality of coefficients across two differents tobit estimations

 From "Hau Chyi" <[email protected]> To [email protected] Subject Re: st: How CAN I test the equality of coefficients across two differents tobit estimations Date Fri, 22 Aug 2008 14:01:32 -0500

```You need to take into account the correlation of estimators between
the two models.
I think -suest- is what you need.  try - help suest-

tobit Y1 X1 X2 X3 X4
est store model1

tobit Y2 X1 X2 X3
est store model2

suest model1 model2
test [model1_X1 = model2_X1]

On Fri, Aug 22, 2008 at 1:52 PM, olivier lohest <[email protected]> wrote:
>
> Dear Statalisters,
>
> I have the following problem but couldnt solved it quite sometime.
>
> I have estimated with tobit regressions two differents equations (on cross section data) i.e
>
> TOBIT Y1 X1 X2 X3 X4
>
> and
>
> TOBIT Y2 X1 X2 X3
>
> the explanatory variables are the same in the two equations but the Y are not the same (Y1 is the concentration rate of firms created by a man, and Y2 is the concentration rate of firms created by a woman)
>
> I would like to test if the coefficients of X1 are the same in the two equations ?
>
> DO YOU HAVE A SOLUTION?
>
> HOW CAN I PROGRAM THIS IN STATA?
>  Thanks a lot
> ol
>
>
>
>
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--
Hau Chyi,
Assistant Professor of Economics
The Wang Yanan Institute for Studies in Economics (WISE)
Xiamen University