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标题: 求教求教 [打印本页]

作者: shiyiming 时间: 2010-12-22 20:16
标题: 求教求教
模拟实验：方差分析
data a;
n=10;
sigma=20;
seed=1123;
a=5;
do group=1 to 3;
      miu=a*group;
   do i=1 to n;
         x=miu+rannor(seed)*sigma;
     output;
      end;
end;
keep group x;
proc anova;
class group;
model x=group;
means group;
run;
这段程序说明了个啥问题啊？为什么用随机数啊?

作者: shiyiming 时间: 2012-8-6 12:59
标题: Re: 求教求教
[code:2lt1osb0]

/*--------------------------------------------
|                                           |
|模拟出方差分析所需要的数据,因方差分析的假定是:    |
| (1)各处理组样本独立同正态分布;             |
| (2)各处理组样本等方差.                   |
|                                           |
/*--------------------------------------------*/

data a;
n=10;
sigma=20;
seed=1123;
a=5;
do group=1 to 3;
miu=a*group;
do i=1 to n;
   x=miu+rannor(seed)*sigma;
   output;
end;
end;
keep group x;
run;
/*---------------方差分析----------------*/
proc anova;
class group;
model x=group;
means group;
run;
[/code:2lt1osb0]

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