求助，关于用sas 进行independent t test

shiyiming

需要处理一些数据，基本格式如下

var1 var2 var3

...  ...   ...

但independent t test不是需要 先将var1 var2 var3合成一个var，class后才进行下一步吗？

现在我的疑问就是：用sas怎么合成那个var呢？

谢谢各位了

shiyiming

i will assume the three vars are the three classes for the same thing. for example, three levels of age.
first, you cannot do t test for more than 3 levels. if so ,that called anova.
if you want to combine the three columns into one you can do like that
data dset1(keep=class var1 rename=(var1=var)) dset2(keep=class var2 rename=(var2=var))  dset3(keep=class var3 rename=(var3=var));
set yourdata;
class=1;ouput dset1;
class=2; output dset2;
class=3;output dset3;
run;
data dset;
set dset1 dset2 dset3;
run;
proc glm;
class class;
model var=class;
run;