我将两个dummy的交互项作为IV
在控制性别gender之后ivreg2,发现不显著,如果单独对男性和女性回归却都是非常显著的
突然发现三条回归之中都有warning:
Warning: estimated covariance matrix of moment conditions not of full rank.
overidentification statistic not reported, and standard errors and
model tests should be interpreted with caution.
Possible causes:
singleton dummy variable (dummy with one 1 and N-1 0s or vice versa)
partial option may address problem.
请大神答疑这具体是什么意思,哪里出现了问题呢?warning里说过度识别检验没有报,和矩阵未满秩有关?


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