请教一下:
59个国家,9年的数据。hausman检验后添加不同选项后,得出不同的检验结果,到底是应该选择固定效应模型还是,随机效应模型
呢?
hausman FE RE, sigmaless
Test: Ho: difference in coefficients not systematic
chi2(10) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 14.50
Prob>chi2 = 0.1514
. hausman FE RE, sigmamore
Test: Ho: difference in coefficients not systematic
chi2(10) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 14.26
Prob>chi2 = 0.1614
hausman FE RE, constant sigmamore
Test: Ho: difference in coefficients not systematic
chi2(8) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 19.09
Prob>chi2 = 0.0144
(V_b-V_B is not positive definite)
hausman FE RE
Test: Ho: difference in coefficients not systematic
chi2(9) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 19.87
Prob>chi2 = 0.0187
(V_b-V_B is not positive definite)


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