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Eviews结果:
Correlated Random Effects - Hausman Test
Pool: PATENT
Test cross-section random effects
Test Summary Chi-Sq. Statistic Chi-Sq. d.f. Prob.
Cross-section random 13.328602 4 0.0098
Cross-section random effects test comparisons:
Variable Fixed Random Var(Diff.) Prob.
x? 0.732052 0.817307 0.001945 0.0532
x?(-1) 1.146872 1.263887 0.004034 0.0654
x?(-2) 0.992879 1.007556 0.000110 0.1613
x?(-3) 1.293675 1.157146 0.003739 0.0256
_________________________
Stata结果:
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fixed random Difference S.E.
-------------+----------------------------------------------------------------
x | .7320521 .8173068 -.0852547 .0357932
x(-1) | 1.146872 1.263887 -.117015 .0499958
x(-2) | .9928792 1.007556 -.0146772 .
x(-3) | 1.293675 1.157146 .1365289 .0446927
------------------------------------------------------------------------------
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)
= 2.08
Prob>chi2 = 0.7208
(V_b-V_B is not positive definite)


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