下面是我的回归结果,我用的是heckman二步回归法,我想问一下这个模型从哪一个数据看是否有自选择偏差,逆米尔斯比是 哪一个,这个有什么用,麻烦大神能够解答,谢谢啦
Heckman selection model Number of obs = 10,680
(regression model with sample selection) Censored obs = 10,205
Uncensored obs = 475
Wald chi2(7) = 158.60
Log likelihood = -6533.655 Prob > chi2 = 0.0000
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| Coef. Std. Err. z P>|z| [95% Conf. Interval]
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x6 |
x1 | 3871.275 886.2006 4.37 0.000 2134.354 5608.197
x3 | -1140.378 283.2919 -4.03 0.000 -1695.62 -585.1361
x4 | 12.85315 6.083099 2.11 0.035 .9304996 24.77581
x5 | 77.04065 16.47993 4.67 0.000 44.74058 109.3407
x7 | .0134169 .0044025 3.05 0.002 .0047881 .0220456
x8 | 82.27848 17.45045 4.71 0.000 48.07623 116.4807
x9 | -.0205846 .0052963 -3.89 0.000 -.0309652 -.010204
_cons | 22359.92 1579.21 14.16 0.000 19264.72 25455.11
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x2 |
x1 | -.2746864 .0561141 -4.90 0.000 -.3846679 -.1647048
x3 | .0762502 .0184298 4.14 0.000 .0401284 .112372
x4 | -.0008242 .0004024 -2.05 0.041 -.0016129 -.0000356
x5 | -.0059912 .0010814 -5.54 0.000 -.0081107 -.0038717
x7 | 9.73e-07 3.02e-07 3.22 0.001 3.81e-07 1.57e-06
x8 | -.0058207 .0010606 -5.49 0.000 -.0078995 -.003742
x9 | 1.22e-07 7.44e-08 1.64 0.101 -2.37e-08 2.68e-07
_cons | -1.391002 .0786636 -17.68 0.000 -1.54518 -1.236824
-------------+----------------------------------------------------------------
/athrho | -2.71002 .0878771 -30.84 0.000 -2.882256 -2.537784
/lnsigma | 9.578694 .0442663 216.39 0.000 9.491934 9.665454
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rho | -.9911851 .0015424 -.9937458 -.9875825
sigma | 14453.53 639.8038 13252.4 15763.53
lambda | -14326.12 648.049 -15596.28 -13055.97
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LR test of indep. eqns. (rho = 0): chi2(1) = 433.78 Prob > chi2 = 0.0000