黃河泉 发表于 2017-1-2 08:56 
如同夏目版主讲的，观察值在 logitic regression 显然被消去了许多 (超过 3,000 笔)。所以我猜想你 show 出 ...
数据都是一样的 我也不知道为什么观测值会差这么多 大概有什么原因呢？？
. reg agriculture land circuland fproperty welfare indinc town distance fedu fmed food familysize gap_fam
Source | SS df MS Number of obs = 4322
-------------+------------------------------ F( 12, 4309) = 123.09
Model | 197.857306 12 16.4881088 Prob > F = 0.0000
Residual | 577.182028 4309 .133948022 R-squared = 0.2553
-------------+------------------------------ Adj R-squared = 0.2532
Total | 775.039334 4321 .179365733 Root MSE = .36599
------------------------------------------------------------------------------
agriculture | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
land | .0236624 .0008426 28.08 0.000 .0220106 .0253143
circuland | .0059189 .001523 3.89 0.000 .002933 .0089048
fproperty | 2.82e-07 2.07e-07 1.36 0.174 -1.25e-07 6.88e-07
welfare | -.0000171 1.26e-06 -13.59 0.000 -.0000196 -.0000147
indinc | -1.53e-06 5.81e-07 -2.63 0.009 -2.67e-06 -3.88e-07
town | .0000432 .0000987 0.44 0.662 -.0001503 .0002367
distance | 2.61e-06 1.53e-06 1.71 0.088 -3.86e-07 5.61e-06
fedu | -3.32e-06 1.05e-06 -3.16 0.002 -5.38e-06 -1.26e-06
fmed | -1.29e-06 5.43e-07 -2.38 0.018 -2.36e-06 -2.26e-07
food | -7.54e-07 8.14e-07 -0.93 0.354 -2.35e-06 8.41e-07
familysize | .0345835 .0033504 10.32 0.000 .028015 .0411521
gap_fam | -.0047378 .001125 -4.21 0.000 -.0069433 -.0025323
_cons | .5474335 .0157844 34.68 0.000 .516488 .5783791
------------------------------------------------------------------------------
Logistic regression Number of obs = 1091
LR chi2(11) = 69.11
Prob > chi2 = 0.0000
Log likelihood = -248.9191 Pseudo R2 = 0.1219
------------------------------------------------------------------------------
agriculture | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
land | 0 (omitted)
circuland | 2.626853 1.275029 2.06 0.039 .1278421 5.125865
fproperty | -.0002473 .0001854 -1.33 0.182 -.0006107 .0001162
welfare | -.0000317 .0000224 -1.42 0.157 -.0000756 .0000122
indinc | .0000154 7.10e-06 2.17 0.030 1.48e-06 .0000293
town | -.0014803 .0040322 -0.37 0.714 -.0093833 .0064228
distance | .0000755 .0000426 1.77 0.076 -7.98e-06 .000159
fedu | .0000134 .00002 0.67 0.505 -.0000259 .0000526
fmed | -.0000317 .0000296 -1.07 0.285 -.0000897 .0000263
food | 8.71e-06 9.61e-06 0.91 0.364 -.0000101 .0000275
familysize | .2196182 .0660116 3.33 0.001 .0902379 .3489984
gap_fam | -.0288658 .0408267 -0.71 0.480 -.1088846 .0511529
_cons | -3.529878 .330779 -10.67 0.000 -4.178193 -2.881563
------------------------------------------------------------------------------
Note: 1 failure and 2 successes completely determined.
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这是两次回归的结果，烦请指教 谢谢
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