请问:用豪斯曼检验SEM模型的固定效应和随机效应,结果没有输出P值,但是SAR模型的豪斯曼检验结果就输出了P值,这是为什么呢??结果如下:SEM: hausman fe re
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
TI | 3.547915 3.629093 -.0811778 .
gt | 10.74638 6.960185 3.786191 .
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xsmle
B = inconsistent under Ha, efficient under Ho; obtained from xsmle
Test: Ho: difference in coefficients not systematic
chi2(2) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= -4.48 chi2<0 ==> model fitted on these
data fails to meet the asymptotic
assumptions of the Hausman test;
see suest for a generalized test
SAR: hausman fe re
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
gt | -715.7259 58.41154 -774.1374 103.5237
TI | 2.812756 3.532057 -.7193008 .3562711
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xsmle
B = inconsistent under Ha, efficient under Ho; obtained from xsmle
Test: Ho: difference in coefficients not systematic
chi2(2) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 103.13
Prob>chi2 = 0.0000


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