命令是hausman fixed_effects randam_effects


        ---- Coefficients ----
        (b)          (B)            (b-B)     sqrt(diag(V_b-V_B))
        fixed_effe~s random_eff~s    Difference          S.E.
       
age        -1.625    -1.172268       -.4527317               .
       
        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(1) = (b-B)'[(V_b-V_B)^(-1)](b-B)
        =    -1.72    chi2<0 ==> model fitted on these
        data fails to meet the asymptotic
        assumptions of the Hausman test;
        see suest for a generalized test
chi2显著为正，则固定效应模型更好，如果显著不为正，则随机效应更加合适

额，谢谢啦，不过hausman检验我知道的，还是很感谢，我当时发帖发错了，应该还heckman，不是hausman，现在我也懂了，谢谢啦