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