请教关于hausman检验的问题

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. hausman fe11 .

Note: the rank of the differenced variance matrix (1) does not equal the number of coefficients being tested
        (7); 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.

在做hausman检验时出现以上提示，哪位高人知道是什么意思，怎么处理？请帮忙。

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关键词：Hausman检验 hausman ausman Aus Man unexpected computing anything possibly problems

先做fe
并保存
然后做re
在保存

之后才可以做hausman检验

你好，谢谢，我就是这样做的，但给出上面的提示，不知什么意思？

gzgdavid 发表于 2011-5-26 19:19 . hausman fe11 .
Note: the rank of the differenced variance matrix (1) does not equal the number of coefficients being tested (7); 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.

Var(bfe)-Var(bre)的秩不等于系数bfe或bre的维数。

你把变量的单位（从而数值）放缩一下，再做一遍。