Posted by
Maguin, Eugene on
Dec 19, 2011; 4:43pm
URL: http://spssx-discussion.165.s1.nabble.com/Can-I-compare-two-within-subjects-dependent-variables-while-holding-co-variates-tp5085591p5086677.html
NHR,
You are going to have to restructure your data and use Mixed. Look through
the documentation in the syntax reference. I think what you are describing
is explicitly mentioned, although I am not sure.
Gene Maguin
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of NHR
Sent: Monday, December 19, 2011 11:22 AM
To:
[hidden email]
Subject: Re: Can I compare two within-subjects' dependent variables while
holding co-variates?
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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