. hausman fe re
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
lnperK | .5351508 .5414755 -.0063248 .
lnperR | .0182561 .0181194 .0001367 .
lnperS | -.0006409 .0003014 -.0009422 .
DlnperS | -.0176543 -.0171403 -.000514 .
------------------------------------------------------------------------------
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(4) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 41205.98
Prob>chi2 = 0.0000
(V_b-V_B is not positive definite)
这个能不能看出模型有没有内生性?从哪儿看?这结果是说明选择fe模型吗?