求问两次回归结果不一样是为啥

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收藏 2021-01-20

两次回归结果不一样，第一次是OFDI和GDP，第二次是OFDI和GDP和Inslogit OFDI GDP_Per Ins_Dis
Iteration 0: log likelihood = -968.97558
Iteration 1: log likelihood = -944.80815
Iteration 2: log likelihood = -944.27646
Iteration 3: log likelihood = -944.27634
Iteration 4: log likelihood = -944.27634

Logistic regression                            Number of obs    =    1,750
                                             LR chi2(2)       =    49.40
                                             Prob > chi2    =    0.0000
Log likelihood = -944.27634                   Pseudo R2       =    0.0255

------------------------------------------------------------------------------
      OFDI |    Coef. Std. Err.    z P>|z|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
   GDP_Per | .0000179 3.36e-06    5.34 0.000    .0000114 .0000245
   Ins_Dis | .0220893 .0449115    0.49 0.623 -.0659355 .1101142
   _cons |  -1.332994 .083587 -15.95 0.000 -1.496822 -1.169167
------------------------------------------------------------------------------
logit OFDI Ins_Dis

Iteration 0: log likelihood = -968.97558
Iteration 1: log likelihood =  -958.8958
Iteration 2: log likelihood = -958.77287
Iteration 3: log likelihood = -958.77287

Logistic regression                            Number of obs    =    1,750
                                             LR chi2(1)       =    20.41
                                             Prob > chi2    =    0.0000
Log likelihood = -958.77287                   Pseudo R2       =    0.0105

------------------------------------------------------------------------------
      OFDI |    Coef. Std. Err.    z P>|z|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
   Ins_Dis | .1656136 .0360008    4.60 0.000    .0950533 .2361738
   _cons | -1.40377 .0822577 -17.07 0.000 -1.564992 -1.242548
------------------------------------------------------------------------------