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shuangren 发表于 2009-8-10 23:10:13 |AI写论文

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用stata分析random effect，得出以下表格，不知道怎么分析z 下面那些数值, 大家多帮帮忙啊！！
xtreg  lev_td size ndst profit tang gop risk , re
Random-effects GLS regression                Number of obs    =    800
Group variable: id                            Number of groups =    200
R-sq:  within  = 0.0435                      Obs per group: min =       4
   between = 0.0329                                     avg =    4.0
   overall = 0.0342                                     max =       4
Random effects u_i ~ Gaussian                Wald chi2(6)    =    33.56
corr(u_i, X)    = 0 (assumed)             Prob > chi2       = 0.0000
------------------------------------------------------------------------------
   lev_td |    Coef. Std. Err.    z P>|z|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
      size | -.005485 .0133634 -0.41 0.681 -.0316769 .0207069
      ndst |  -.0104462 .0347962 -0.30 0.764 -.0786455    .057753
   profit |  -.1325927 .0336387 -3.94 0.000 -.1985233 -.066662
      tang | .0236601 .0683387    0.35 0.729 -.1102814 .1576016
      gop |  -.0072463 .0049338 -1.47 0.142 -.0169164 .0024239
      risk |  -.0436494 .0132959 -3.28 0.001 -.0697089    -.01759
   _cons |    .3815 .1099555    3.47 0.001    .1659912 .5970087
-------------+----------------------------------------------------------------
   sigma_u |  .12608601
   sigma_e |  .06158752
      rho |  .80736987 (fraction of variance due to u_i)
------------------------------------------------------------------------------