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非常非常感谢二楼的前辈!!!
运行完之后出现了一个Note,请问是什么意思呢,另外我用STATA运行的结果, chi2(2) = 60.87,而书上用Eviews运行的结果是Chi-Sq=49.619,请问这是怎么回事呢??
Note: the rank of the differenced variance matrix (2) does not equal the number of coefficients being tested (3); 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.
-------------+----------------------------------------------------------------
q | 3319023 2288588 1030435 131808
pf | .7730708 1.123591 -.3505205 .
lf | -3797368 -3084994 -712373.5 .
------------------------------------------------------------------------------
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(2) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 60.87
Prob>chi2 = 0.0000
(V_b-V_B is not positive definite)
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