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向各位大牛请教一个问题，我进行了工具变量回归，进行检验，系统无法报告“Hansen-J 过度识别检验”值，提示如下：------------------------------------------------------------------------------
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.
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这个要怎么解决啊？我用的是ivreg2。求大牛们指导。
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