昨天我做多元线性回归分析的时候，发现我的结果竟然有两个？我用的16.0，哪位高手给指点下吧？万分感激！ （以下第5和第7其实是一个模型七个变量中两组五个显著的，怎么会这样啊？我用的STEPWISE，我不知道怎么取舍啊？）   Coefficients(a)
  Unstandardized Coefficients  Standardized Coefficients   Collinearity Statistics
Model  B Std. Error Beta t Sig. Tolerance VIF
1 (Constant) 14.847 .133  111.529 .000  
RDIt-1 .464 .112 .265 4.136 .000 1.000 1.000
2 (Constant) 13.767 .364  37.850 .000  
RDIt-1 .521 .111 .298 4.675 .000 .974 1.026
SIZE亿元 .396 .124 .203 3.183 .002 .974 1.026
3 (Constant) 13.420 .377  35.606 .000  
RDIt-1 .487 .110 .279 4.426 .000 .964 1.038
SIZE亿元 .411 .122 .210 3.354 .001 .973 1.028
ROA 5.447 1.866 .182 2.919 .004 .986 1.014
4 (Constant) 12.963 .416  31.189 .000  
RDIt-1 .499 .109 .286 4.582 .000 .962 1.040
SIZE亿元 .442 .122 .226 3.631 .000 .962 1.039
ROA 4.916 1.857 .164 2.647 .009 .973 1.028
D1 .548 .221 .154 2.486 .014 .975 1.025
5 (Constant) 12.645 .440  28.756 .000  
RDIt-1 .484 .108 .277 4.468 .000 .958 1.044
SIZE亿元 .477 .122 .245 3.913 .000 .944 1.060
ROA 3.216 2.015 .107 1.596 .112 .814 1.228
D1 .578 .219 .162 2.635 .009 .971 1.030
Q .178 .085 .141 2.088 .038 .807 1.238
6 (Constant) 12.685 .441  28.794 .000  
RDIt-1 .497 .108 .284 4.578 .000 .963 1.039
SIZE亿元 .483 .122 .247 3.949 .000 .944 1.059
D1 .624 .218 .175 2.859 .005 .988 1.012
Q .232 .078 .185 2.977 .003 .965 1.036
7 (Constant) 11.794 .598  19.735 .000  
RDIt-1 .496 .108 .284 4.606 .000 .963 1.039
SIZE亿元 .566 .127 .290 4.453 .000 .860 1.162
D1 .512 .222 .144 2.302 .022 .936 1.069
Q .261 .079 .207 3.327 .001 .938 1.066
CS 1.273 .583 .144 2.184 .030 .841 1.189
a. Dependent Variable: RD