第一次做面板数据,还不太懂,求问前辈们,这种情况是使用固定效果还是随机效果呀??
显示如下:
hausman fe
Note: the rank of the differenced variance matrix (5) does not equal the number of coefficients being tested (6); 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.
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
gdpj | -.186349 .0069755 -.1933246 .0462095
popj | 4.308246 .0411346 4.267112 1.170286
popi | -.3771429 -.2058826 -.1712602 .0125757
proi | -.0013476 -.0009046 -.0004429 .
ecx | .287833 -23.39214 23.67997 17.95976
pi | 1495.359 1064.477 430.8823 263.7993
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xtreg
B = inconsistent under Ha, efficient under Ho; obtained from xtreg
Test: Ho: difference in coefficients not systematic
chi2(5) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 10.95
Prob>chi2 = 0.0525
(V_b-V_B is not positive definite)


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