arlionn 发表于 2012-3-20 08:50
由于没有看到具体数据,我也不太确定问题出在哪里。不过,论文中很少报告 chi2 值。
连老师,您帮我看看.
. xtreg w_rdgs_dp w_tfp_lp pc actdum fb $cona $area $indu $year, re robust cluster(id)
Random-effects GLS regression Number of obs = 1450
Group variable: id Number of groups = 529
R-sq: within = 0.0226 Obs per group: min = 1
between = 0.1211 avg = 2.7
overall = 0.0658 max = 7
Wald chi2(31) = 64.00
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0004
(Std. Err. adjusted for 529 clusters in id)
Robust
w_rdgs_dp Coef. Std. Err. z P>|z| [95% Conf. Interval]
w_tfp_lp -5.661512 1.647925 -3.44 0.001 -8.891385 -2.431639
pc 1.647489 1.414227 1.16 0.244 -1.124344 4.419322
actdum 4.156381 1.641691 2.53 0.011 .9387267 7.374036
fb 2.964916 1.775937 1.67 0.095 -.5158571 6.44569
w_lev 9.794413 5.318462 1.84 0.066 -.6295813 20.21841
w_growth -3.931117 2.137813 -1.84 0.066 -8.121153 .2589182
w_manage -8.273467 3.636864 -2.27 0.023 -15.40159 -1.145345
w_capital_as 2.911468 1.074252 2.71 0.007 .805972 5.016964
w_employa -.0976049 .8091332 -0.12 0.904 -1.683477 1.488267
w_lnasset -2.197348 .8848904 -2.48 0.013 -3.931701 -.4629943
w_lnage -.3726409 1.836595 -0.20 0.839 -3.972301 3.227019
w_h3 -12.35768 5.672104 -2.18 0.029 -23.4748 -1.240558
area_dum2 2.083866 3.160761 0.66 0.510 -4.111112 8.278843
area_dum3 .7387732 3.378895 0.22 0.827 -5.88374 7.361286
area_dum4 -1.059868 4.748704 -0.22 0.823 -10.36716 8.24742
area_dum5 4.036306 4.169152 0.97 0.333 -4.135082 12.20769
area_dum6 -2.275075 3.057881 -0.74 0.457 -8.268412 3.718262
indu_dum2 2.540734 5.428724 0.47 0.640 -8.099369 13.18084
indu_dum3 -1.418513 2.746518 -0.52 0.606 -6.801589 3.964563
indu_dum4 2.228628 4.190515 0.53 0.595 -5.98463 10.44189
indu_dum5 -6.813475 2.358388 -2.89 0.004 -11.43583 -2.191119
indu_dum6 -4.650413 2.959087 -1.57 0.116 -10.45012 1.14929
indu_dum7 -3.093613 2.891101 -1.07 0.285 -8.760066 2.57284
indu_dum8 -4.058192 2.736872 -1.48 0.138 -9.422362 1.305978
indu_dum9 -8.954838 3.255874 -2.75 0.006 -15.33623 -2.573441
year_dum2 -.6660892 1.908675 -0.35 0.727 -4.407023 3.074844
year_dum3 1.455915 2.113208 0.69 0.491 -2.685896 5.597725
year_dum4 .4397084 1.734909 0.25 0.800 -2.96065 3.840067
year_dum5 7.000571 2.663299 2.63 0.009 1.780601 12.22054
year_dum6 7.192509 2.574446 2.79 0.005 2.146688 12.23833
year_dum7 7.728862 2.629039 2.94 0.003 2.57604 12.88168
_cons 33.0568 11.23186 2.94 0.003 11.04276 55.07084
sigma_u 7.3859076
sigma_e 24.393637
rho .08397711 (fraction of variance due to u_i)
xtreg w_rdgs_dp w_tfp_lp pc actdum fb $cona $area $indu $year, re robust cluster(indu)
Random-effects GLS regression Number of obs = 1450
Group variable: id Number of groups = 529
R-sq: within = 0.0226 Obs per group: min = 1
between = 0.1211 avg = 2.7
overall = 0.0658 max = 7
Wald chi2(8) = .
corr(u_i, X) = 0 (assumed) Prob > chi2 = .
(Std. Err. adjusted for 9 clusters in indu)
Robust
w_rdgs_dp Coef. Std. Err. z P>|z| [95% Conf. Interval]
w_tfp_lp -5.661512 1.723884 -3.28 0.001 -9.040262 -2.282761
pc 1.647489 .6448088 2.56 0.011 .3836872 2.911291
actdum 4.156381 1.328166 3.13 0.002 1.553224 6.759538
fb 2.964916 1.069011 2.77 0.006 .8696938 5.060139
w_lev 9.794413 4.57453 2.14 0.032 .8284994 18.76033
w_growth -3.931117 2.516738 -1.56 0.118 -8.863833 1.001599
w_manage -8.273467 4.843094 -1.71 0.088 -17.76576 1.218823
w_capital_as 2.911468 .9536258 3.05 0.002 1.042396 4.78054
w_employa -.0976049 .7697532 -0.13 0.899 -1.606293 1.411084
w_lnasset -2.197348 .6726968 -3.27 0.001 -3.515809 -.8788862
w_lnage -.3726409 1.595079 -0.23 0.815 -3.498938 2.753656
w_h3 -12.35768 6.210609 -1.99 0.047 -24.53025 -.1851077
area_dum2 2.083866 2.896726 0.72 0.472 -3.593614 7.761345
area_dum3 .7387732 2.459155 0.30 0.764 -4.081081 5.558627
area_dum4 -1.059868 2.802059 -0.38 0.705 -6.551804 4.432067
area_dum5 4.036306 2.996548 1.35 0.178 -1.836819 9.909432
area_dum6 -2.275075 2.832111 -0.80 0.422 -7.82591 3.275759
indu_dum2 2.540734 .8382171 3.03 0.002 .8978582 4.183609
indu_dum3 -1.418513 .4362996 -3.25 0.001 -2.273645 -.5633818
indu_dum4 2.228628 .8129474 2.74 0.006 .6352802 3.821975
indu_dum5 -6.813475 .9728887 -7.00 0.000 -8.720302 -4.906649
indu_dum6 -4.650413 .5416697 -8.59 0.000 -5.712066 -3.58876
indu_dum7 -3.093613 .8623051 -3.59 0.000 -4.7837 -1.403526
indu_dum8 -4.058192 .4320661 -9.39 0.000 -4.905026 -3.211358
indu_dum9 -8.954838 .9538219 -9.39 0.000 -10.82429 -7.085381
year_dum2 -.6660892 2.223743 -0.30 0.765 -5.024545 3.692367
year_dum3 1.455915 3.255438 0.45 0.655 -4.924626 7.836456
year_dum4 .4397084 2.040907 0.22 0.829 -3.560395 4.439812
year_dum5 7.000571 4.42658 1.58 0.114 -1.675366 15.67651
year_dum6 7.192509 1.1419 6.30 0.000 4.954427 9.430591
year_dum7 7.728862 3.990767 1.94 0.053 -.0928981 15.55062
_cons 33.0568 12.67461 2.61 0.009 8.215025 57.89857
sigma_u 7.3859076
sigma_e 24.393637
rho .08397711 (fraction of variance due to u_i)