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ghost337

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[求助] 关于SAS多元线性回归中CP值的计算问题

本人非数学专业学生,最近需要用到多元线性回归解决问题,用到了SAS V8软件,出现了如下问题:
命令:proc reg data=data15;
model y=x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 x17 x18 x19 x20 x21 x22/selection=cp stop=3;
run;
出现了这样的结果:
Number in
  Model        C(p)  R-Square  Variables in Model

       3      .        0.9812  x7 x13 x22
       3      .        0.9623  x13 x14 x16
log窗口:
NOTE: 11 observations read.
NOTE: 11 observations used in computations.
ERROR: Invalid Operation.
NOTE: The SAS System stopped processing this step because of errors.
NOTE: There were 11 observations read from the data set WORK.DATA15.
NOTE: PROCEDURE REG used:
      real time           0.20 seconds
      cpu time            0.00 seconds
不知道为什么算不出CP值,还有,我用另一组同样有22个自变量的数据就很顺利的算了出来,不知道是什么原因,急需帮助,谢谢
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