# 求结果解释，加入时间变量以后两个关键解释变量的符号全变了-经管之家官网！

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xtreg exp rat65 ratmar, fe回归结果中俩解释变量结果
------------------------------------------------------------------------------
staperpop | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
rat65 | .6022233 .0303185 19.86 0.000 .5425422 .6619044
ratmar |-.4358449 .2301252 -1.89 0.059 -.88884 .0171503
_cons | 3.599094 1.744338 2.06 0.040 .1654122 7.032775
-------------+----------------------------------------------------------------
sigma_u |2.9786961
sigma_e |.42635793
rho |.97992348 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(46, 280) = 313.54 Prob > F = 0.0000

xtreg exp rat65 ratmar suryea, fe
------------------------------------------------------------------------------
staperpop | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
rat65 |-.3830402 .0499103 -7.67 0.000 -.4812889 -.2847916
ratmar | .4824183 .1486509 3.25 0.001 .1897985 .775038
suryea | .5762852 .0270562 21.30 0.000 .523025 .6295454
_cons | 10.4597 1.125417 9.29 0.000 8.244316 12.67509
-------------+----------------------------------------------------------------
sigma_u |4.4006658
sigma_e |.26357173
rho |.99642558 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(46, 279) = 830.28 Prob > F = 0.0000

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#### 本文标题：求结果解释，加入时间变量以后两个关键解释变量的符号全变了

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