Sea.Zeng 发表于 2020-4-16 08:59
ivreghdfe y (x1 = IV) x2 x3 i.id i.year, gmm2s。x1为内生变量,id和year为个体及时间变量。
请问您知道这个命令的结果怎么看吗
Underidentification test (Anderson canon. corr. LM statistic): 2526.108
Chi-sq(2) P-val = 0.0000
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Weak identification test (Cragg-Donald Wald F statistic): 1914.988
Stock-Yogo weak ID test critical values: 10% maximal IV size 19.93
15% maximal IV size 11.59
20% maximal IV size 8.75
25% maximal IV size 7.25
Source: Stock-Yogo (2005). Reproduced by permission.
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Sargan statistic (overidentification test of all instruments): 4.452
Chi-sq(1) P-val = 0.0349