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Arellano-Bond test for AR(1) in first differences: z = -4.32 Pr > z = 0.000
Arellano-Bond test for AR(2) in first differences: z = -2.67 Pr > z = 0.008
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Sargan test of overid. restrictions: chi2(64) = 189.16 Prob > chi2 = 0.000
(Not robust, but not weakened by many instruments.)
Hansen test of overid. restrictions: chi2(64) = 29.02 Prob > chi2 = 1.000
(Robust, but weakened by many instruments.)
老是出来这样的结果,都不知道该怎么调整了,怎样才能通过,是不是说明不适合使用系统GMM
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