|Date: ||Fri, 8 Aug 2008 23:29:39 -0700|
|Sender: ||"SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>|
|Subject: ||Is Dependent t OK here?|
|Content-Type: ||text/plain; charset=windows-1252|
This may be a very simple question, but Iím not sure if a dependent t
test is OK here.
I have a survey that was given to around 100 people before and after a
training. On the survey, there are many items relating to 9 major
areas. Most of the areas are measured by a number of items on a 5-
point Likert scale. To test the differences on each of these areas
before and after the training, Iím thinking to add up the item scores
in an area for each participant, so Iíll have a before- and after-
training total scores for that area for all the participants and run a
dependent t test.
But for one particular area, there are only 3 questions/items, and
these items have Yes/No choices, so I have only binary data (before
and after training) for these 3 items. I wonder if I can give 1 to Yes
and 0 to NO, add up the responses within the area for each participant
and run a dependent t test like I plan to do with the other items. My
concern is that if I add up the responses, each participant's area
score can only go from 0 to 3, will the range be too small to meet the
Thanks in advance.