如题,请问各位前辈,我用huasman 检验确定用固定效应模型,但chi2值很大,有九百多,请问这个正常吗?这个是检验结果:
Test: Ho: difference in coefficients not systematic
chi2(28) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 973.30
Prob>chi2 = 0.0000
(V_b-V_B is not positive definite)