topic Re: Two Sample Paired T Test in SAS Procedures

Two Sample Paired T Test

LorcanOB — Wed, 13 Jun 2018 15:11:12 GMT

Using SAS 9.4

My research:

I had a group take a test (Baseline)

This group were then given two different drugs

The group then took the test again (FollowUp 1 [for drug 1] and FollowUp 2 [for drug 2])

I want to compare:

(Baseline to FollowUp1) = X

(Baseline to FollowUp2) = Y

Then compare X and Y to see if there was any difference in baseline to followup score changes relating to drug type

Re: Two Sample Paired T Test

Norman21 — Wed, 13 Jun 2018 15:13:55 GMT

Of course, you planned your analysis when you designed the experiment.

So, what code have your written so far?

Re: Two Sample Paired T Test

Reeza — Wed, 13 Jun 2018 15:23:33 GMT

Sounds exactly like this example here:

http://documentation.sas.com/?docsetId=statug&docsetTarget=statug_ttest_examples03.htm&docsetVersion=14.3&locale=en

Note that the code is included in the example so you can run the example.

If you're just getting into SAS the first statistics course is free on the e-learning page.

@LorcanOB wrote:

Using SAS 9.4

My research:

I had a group take a test (Baseline)

This group were then given two different drugs

The group then took the test again (FollowUp 1 [for drug 1] and FollowUp 2 [for drug 2])

I want to compare:

(Baseline to FollowUp1) = X

(Baseline to FollowUp2) = Y

Then compare X and Y to see if there was any difference in baseline to followup score changes relating to drug type

Re: Two Sample Paired T Test

LorcanOB — Wed, 13 Jun 2018 15:49:23 GMT

Thanks Reeza. I am new (was it that obvious?)

I checked that out before, but I am wondering is there a way to do a comparison of changes within two groups then compare the results of those two comparisons?

I have attached sample data

Re: Two Sample Paired T Test

Reeza — Wed, 13 Jun 2018 15:55:50 GMT

Post your data as text please.

@LorcanOB wrote:

Thanks Reeza. I am new (was it that obvious?)

I checked that out before, but I am wondering is there a way to do a comparison of changes within two groups then compare the results of those two comparisons?

I have attached sample data

Re: Two Sample Paired T Test

LorcanOB — Wed, 13 Jun 2018 16:02:55 GMT

0 4 8
0 9 9
0 17 17
0 2 0
0 6 11
0 6 6
0 21 21
0 10 5
0 12 9
0 10 11
1 3 2
1 16 13
1 18 14
1 11 12
1 4 3
1 10 7
1 7 13
1 9 11
1 2 6
1 21 21
1 8 8
1 1 8
1 5 6
1 13 8

Re: Two Sample Paired T Test

Reeza — Wed, 13 Jun 2018 17:11:07 GMT


data have;
input group pre post;
diff = post-pre;
cards;
0 4 8
0 9 9
0 17 17
0 2 0
0 6 11
0 6 6
0 21 21
0 10 5
0 12 9
0 10 11
1 3 2
1 16 13
1 18 14
1 11 12
1 4 3
1 10 7
1 7 13
1 9 11
1 2 6
1 21 21
1 8 8
1 1 8
1 5 6
1 13 8
;
run;

proc anova data=have;
class group;
model diff = group;
means group / tukey;
quit;