我在做固定效应与随机效应选择时使用豪斯曼检验,发现出现了以下话语:
Note: the rank of the differenced variance matrix (8) does not equal the number of coefficients being tested (9); be sure this is
what you expect, or there may be problems computing the test. Examine the output of your estimators for anything
unexpected and possibly consider scaling your variables so that the coefficients are on a similar scale.
且豪斯曼检验结果表示应该选择随机效应模型,这是出现了什么问题?是否有解决方法?


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