xtabond2下的 sargan检验

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采用sys-gmm.通常会报告两个sargan值，检验结论在有些情况下是相反的。如：

Sargan test of overid. restrictions: chi2(24)   =  67.47  Prob > chi2 =  0.000
  (Not robust, but not weakened by many instruments.)
Hansen test of overid. restrictions: chi2(24)   =  22.74  Prob > chi2 =  0.535
  (Robust, but can be weakened by many instruments.)
如何进行最终判断？

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关键词：XTABOND Sargan abond abo SAR wrong

Sargan test of overid. restrictions: chi2(24)   =  67.47  Prob > chi2 =  0.000
  (Not robust, but not weakened by many instruments.)

Hansen test of overid. restrictions: chi2(24)   =  22.74  Prob > chi2 =  0.535
  (Robust, but can be weakened by many instruments.)

可以进一步看看如下论文中的阐述：
Roodman, D., 2009, How to do xtabond2: An introduction to difference and system gmm in stata, Stata Journal, 9 (1), pp. 86-136.