Date:         Sat, 3 Sep 2005 20:47:09 -0500
Reply-To:     "Granaas, Michael" <mgranaas@usd.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "Granaas, Michael" <mgranaas@usd.edu>
Subject:      Re: MANOVA vs. Repeated Measures ANOVA
Comments: To: "Jin, Shihou" <sjin@udsmr.org>
Content-Type: text/plain; charset="iso-8859-1"

>Jin, Shihou 
 
>One problem to analyze pre-post data with ANCOVA instead of ANOVA is
>that it might lead to collinearity problem if the change score is highly
>related the pretest score

I don't see how this could be a problem.  Collinearity is only a problem when it exists among the predictors.  

Michael

****************************************************
Michael Granaas             mgranaas@usd.edu
Assoc. Prof.                Phone: 605 677 5295
Dept. of Psychology         FAX:  605 677 3195
University of South Dakota
414 E. Clark St.
Vermillion, SD 57069
*****************************************************