Date: Sun, 16 May 2004 05:11:18 GMT
Reply-To: Arthur Tabachneck <art297@NETSCAPE.NET>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Arthur Tabachneck <art297@NETSCAPE.NET>
Subject: Re: One-tailed T-Test
If you use proc ttest then, according to the manual:
Pr > |t|, the probability of a greater absolute value of t under the null
hypothesis. This is the two-tailed significance probability. For a
one-tailed test, halve this probability.
"DG" <email@example.com> wrote in message
> How can I do a one-tailed paired t-test using SAS? I have used the
> code which I think is for two-tailed tests. Completion and accuracy are my
> dependent variables. I have inputed the difference scores of the two
> that I want to compare.