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工具变量的个数对sargan与hansen的影响
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做面板回归,特别是xtabond2,通常会报告如下过度识别结果:
Sargan test of overid. restrictions: chi2(59) = 61.74 Prob > chi2 = 0.378
(Not robust, but not weakened by many instruments.)
Hansen ...
2015-4-2 17:06 - xiongjerry - Stata专版