请问三维面板用ivreghdfe做完2SLS之后,Hansen J 统计量显示 equation exactly identified,是不是有什么问题?问题在哪呀?
Underidentification test (Kleibergen-Paap rk LM statistic): 2388.044
Chi-sq(1) P-val = 0.0000
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Weak identification test (Cragg-Donald Wald F statistic): 3.2e+04
(Kleibergen-Paap rk Wald F statistic): 9576.636
Stock-Yogo weak ID test critical values: 10% maximal IV size 7.03
15% maximal IV size 4.58
20% maximal IV size 3.95
25% maximal IV size 3.63
Source: Stock-Yogo (2005). Reproduced by permission.
NB: Critical values are for Cragg-Donald F statistic and i.i.d. errors.
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Hansen J statistic (overidentification test of all instruments): 0.000
(equation exactly identified)