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st: Re:testing coefficients across subsamples
On Saturday, June 28, 2003, at 02:33 AM, statalist-digest wrote:
It is not clear why pooling the data, and using a fully interacted
specification (the dummy variable approach), using an instrumental
variables (or GMM) technique would not give you what you want. That
would handle the non-independence, and would also allow you to test for
coefficient stability across subsamples.
Thanks for the reply. I too was suspicious of using SURE.
As I have different number of obs in every sample it
makes it stronger the argument of not using it. I guess I
have to pool the sample to test for coefficient differences.
It will however introduce endogeneity in the estimation,
exactly the reason why I had to split the sample.
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