[回归分析求助] 性别工资差Blinder-Oaxaca分解的结果为什么会出现负数？ [推广有奖]

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ciblru

发表于 2019-11-28 16:32:43 |AI写论文

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Blinder-Oaxaca decomposition                   Number of obs    =    1,885
                                                Model          =    linear
Group 1: female = 0                            N of obs 1    =       953
Group 2: female = 1                            N of obs 2    =       932

------------------------------------------------------------------------------
   lnwage |    Coef. Std. Err.    z P>|z|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
overall    |
   group_1 | 10.69005 .0272561 392.21 0.000    10.63663 10.74347
   group_2 | 10.36912 .0261783 396.10 0.000    10.31781 10.42042
  difference | .3209348 .0377916    8.49 0.000    .2468647 .3950049
explained |  -.0170478    .01972 -0.86 0.387 -.0556983 .0216027
unexplained | .3379826 .0329561 10.26 0.000    .2733898 .4025754
-------------+----------------------------------------------------------------
explained |
      huji |  -.0027757 .0027046 -1.03 0.305 -.0080766 .0025252
      exp | .0105756 .0160615    0.66 0.510 -.0209045 .0420556
      exp2 |  -.0057182 .0129372 -0.44 0.658 -.0310745 .0196382
      educ |  -.0032676 .0139143 -0.23 0.814 -.0305392    .024004
dum_reg1 |  -.0118403 .0110606 -1.07 0.284 -.0335187 .0098382
dum_reg2 | .0011564 .0019857    0.58 0.560 -.0027355 .0050483
dum_reg3 |       0  (omitted)
      mate |  -.0077816 .0046464 -1.67 0.094 -.0168883 .0013251
   health | .0026035 .0030424    0.86 0.392 -.0033595 .0085665
-------------+----------------------------------------------------------------
unexplained  |
      huji | -.068352 .0792615 -0.86 0.388 -.2237017 .0869978
      exp | .0698738 .2075133    0.34 0.736 -.3368449 .4765924
      exp2 | .0034302 .1208471    0.03 0.977 -.2334258 .2402863
      educ |  -.0943158 .1530214 -0.62 0.538 -.3942323 .2056006
dum_reg1 | .0768962 .0556324    1.38 0.167 -.0321413 .1859337
dum_reg2 | .0198203 .018599    1.07 0.287    -.016633 .0562736
dum_reg3 | -.011112 .0103038 -1.08 0.281    -.031307    .009083
      mate | .1589562 .0735638    2.16 0.031    .0147738 .3031386
   health | .0854658 .0403244    2.12 0.034    .0064315 .1645002
   _cons | .0973199 .2094549    0.46 0.642 -.3132042    .507844
------------------------------------------------------------------------------

其中explained的系数为什么会出现负数？