Date: Mon, 19 Dec 2011 08:21:53 -0800
Reply-To: NHR <noahermesh@gmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: NHR <noahermesh@gmail.com>
Subject: Re: Can I compare two within-subjects' dependent variables while
holding co-variates?
In-Reply-To: <4EEF3303.5070807@DrKendall.org>
Content-Type: text/plain; charset=us-ascii
Hi,
Thanks a lot for your replay.
My dependent variables are PTSD measures. I have 3 sub-scales and one total
measure. These 4 measures refer to two different events, so each participant
has 8 measures (4 for every event - 4 couples).
I wanted to compare, for example the degree of avoidance symptoms between
event 1 and 2, and so on, regarding each couple. Each participant has 2
marks/grads, for each measure - one for every event.
But, than I wand to hold as co-variates the time duration that passed since
each event. I wanted to do that cause there is a significant difference
between the time duration that passed between the two events.
While doing an ANOVA or MANOVA, the two co-variates (duration since each
event) influence the two dependent variables, and that is no good. I thinks
there is no point in holding as co-variate the duration since event 1 while
looking at the symptomolgy after event 2.
So, I was wondering how can I compare my dependent variables in a better
way?
The participants were all volunteers, who agreed to participate in a
web-survey.
I hope my answers are clear.
Please let me know if not, and I'll be happy to answer.
Thanks a lot,
I really appreciate it,
NHR
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