结果显示随机效应和固定效应的系数完全一样,是不是模型设定有问题?那么在模型中应该包括什么样的变量,不应该包括什么样的变量?请帮忙解释一下。
结果如下:
. hausman fe re
Note: the rank of the differenced variance matrix (0) does not equal the number of
coefficients being tested (25); 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.
age .0045541 .0045541 0 0
edu .0038495 .0038495 0 0
seek 1.533309 1.533309 0 0
serious3 1.151252 1.151252 0 0
serious4 .9008266 .9008266 0 0
waittime -.0015065 -.0015065 0 0
faci2 1.416447 1.416447 0 0
faci3 1.179771 1.179771 0 0
faci4 1.294124 1.294124 0 0
faci5 .8568332 .8568332 0 0
lnpri .1222691 .1222691 0 0
lninc -.0171524 -.0171524 0 0
male -.0941756 -.0941756 0 0
b = consistent under Ho and Ha; obtained from xtprobit
B = inconsistent under Ha, efficient under Ho; obtained from xtprobit
Test: Ho: difference in coefficients not systematic
chi2(0) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 0.00
Prob>chi2 = .
(V_b-V_B is not positive definite)


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