SAS中文论坛

标题: 怎么用sas生成高斯数据? [打印本页]

作者: shiyiming 时间: 2004-4-30 19:44
标题: 怎么用sas生成高斯数据?
我在学习sas时,想要些高斯数据,不知怎么用sas生成,请指点.

作者: shiyiming 时间: 2004-4-30 21:54
There is a random number generator RANNOR, which is a function in SAS/BASE.

作者: shiyiming 时间: 2004-5-1 16:33
标题: 高斯数据
老兄，能不能具体一点，我给你一个6维的高斯分布，麻烦你给我生成一个高斯数据看看。

作者: shiyiming 时间: 2004-5-3 01:30
You have to present your question more specifically.  The following code assume xi follows normal(mui,stdi**2), and independence of xi and xj.  If you have a specific covariance matrix, you can add them in, but you may need to go SAS/IML for matrix calculations.

data normal(keep=x1-x6);
mu1=1; mu2=2; mu3=3; mu4=4; mu5=5; mu6=6;
std1=0.1; std2=0.2; std3=0.3; std4=0.4; std5=0.5; std6=0.6;
do i=1 to 100;
  x1=mu1+std1*rannor(0);
  x2=mu2+std2*rannor(0);
  x3=mu3+std3*rannor(0);
  x4=mu4+std4*rannor(0);
  x5=mu5+std5*rannor(0);
  x6=mu6+std6*rannor(0);
  output;
end;
run;

作者: shiyiming 时间: 2004-5-12 09:55
标题: 如果要生成服从六元正态分布的随机数据呢
我理解它和独立生成六个正态分布随机变量所采用的sas程序应该是不一样的吧。
想知道用iml过程怎么写，谢谢!

欢迎光临 SAS中文论坛 (http://mysas.net/forum/)