How to run a two sample t test between two variables?

[Ritter]

I'm a new user to SAS and I want to figure out how to run a two sample test between two variables in a data set.

As I know, the proc T-test can only use class to specify the variable with 2 class to do the 2 sample test, but I want to do 2 sample test between variables.

For example;

x  y

1  2

3  4

5  6

I want to test the X and Y's means with 2 sample t-test

[ballardw · Accepted solution]

Is this supposed to be a Paired ttest where you are looking at the differences between x and y on each row? Such as in a before/after score?

That would be:

data have;
input x  y  ;
datalines;
1  2
3  4
5  6
;
run;

proc ttest data=have;
   paired x*y;
run;

If you are looking for two independent samples then the data would have to be restructured to include a group variable to distinguish between x and y as data source.

[Ritter]

Thanks for your help !

Actually, I want to do the two independent sample test. But I don't know how to merge two variables into one and add their origin name as a new variable in new data set at same time.

Could you like show me some code?

Thanks

[ballardw]

---

@Ritter wrote:

Thanks for your help !

Actually, I want to do the two independent sample test. But I don't know how to merge two variables into one and add their origin name as a new variable in new data set at same time.

Could you like show me some code?

Thanks

---

Here's one way to restructure the data for two independent samples.

data have;
input x  y  ;
   Group='X'; Value=x;output;
   Group='Y'; value=y;output;
datalines;
1  2
3  4
5  6
;
run;

proc ttest data=have;
   class group;
   var value;
run;