Can I compare two within-subjects' dependent variables while holding co-variates?

Posted by NHR on Dec 19, 2011; 9:48am
URL: http://spssx-discussion.165.s1.nabble.com/Can-I-compare-two-within-subjects-dependent-variables-while-holding-co-variates-tp5085591.html

Hello All,

I want to compare a series of dependent variables, and they are all within subjects.
I already done a series of paired-sample t-test.
But now, I want to hold some independent variables as co-variates. However, since these co-variates are also within-subjects, I'm not sure how can I do that...
Someone told me vaguely of a way including parallel regressions and than comparing the residuals...

So, can I compare two within-subjects' dependent variables while holding co-variates?
 If so, can it be done in SPSS?

Thanks in advance!!

NHR