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st: Two-step Probit after merging

Subject   st: Two-step Probit after merging
Date   Mon, 13 Sep 2010 19:20:42 +0200 (CEST)

Dear Statalist,

I would like to know, how realiable can be the results of a Probit model
after merging two datasets.

I will try to explain it by using the example of the PDF information:

merge m:1 region using

Suppose that the two data sets refer to two years (2 and 3). The model
includes a dummy variable (sold=1, not sold=0) and the sales of year 3
depend on the costs of year 2. The model was run as:

ivprobit sold name i.region (sales3 = cost2), twostep

Looking at the ivprobit, timeseries varlists are admited. But in this
case, these variables comes from two different datasets that have been

Could you please tell me if there is another way to work with this merged

Thanks a lot

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