st: Chow test for GMM

[Ahmad Abdul Jalil <Ahmad.Abdul_Jalil@u-clermont1.fr>]

Hi,

can anyone help me with the temporal stability test with xtabond2. I
wanted to divide my sample into three sub samples and test for the
stability of the coefficients. I tried using the Chow test but I get a
negative numerator (the RSS for the whole sample is smaller than the sum
of the three subsamples RSS).

Thanks
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