黃河泉 发表于 2019-7-18 09:26 
很不幸地,事情跟你想的可能不太一样,这是 (如楼上所说) 工具变量太多的一个 (不好) 讯号!
Arellano-Bond test for AR(1) in first differences: z = -2.75 Pr > z = 0.006
Arellano-Bond test for AR(2) in first differences: z = -0.25 Pr > z = 0.801
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Sargan test of overid. restrictions: chi2(7) = 38.49 Prob > chi2 = 0.000
(Not robust, but not weakened by many instruments.)
Hansen test of overid. restrictions: chi2(7) = 39.82 Prob > chi2 = 0.000
(Robust, but weakened by many instruments.)
Difference-in-Hansen tests of exogeneity of instrument subsets:
iv(L.logcapexp L2.logcapexp)
Hansen test excluding group: chi2(5) = 33.49 Prob > chi2 = 0.000
Difference (null H = exogenous): chi2(2) = 6.33 Prob > chi2 = 0.042
请问老师这个结果是检验不通过嘛