Posted by
Swank, Paul R on
Aug 14, 2012; 5:37pm
URL: http://spssx-discussion.165.s1.nabble.com/Analyses-Confused-tp5714671p5714694.html
Matthew is correct. Using split file will only tell you if the pretest and posttest are different for each group separately. A repeated measures ANOVA would tell you if there is a change over time (on average across the two groups), whether there is a difference between groups (on average across times) and whether or not the difference between pretest and posttest is the same for both groups (interaction). The ANCOVA will tell you whether the posttest scores (adjusted for the pretest) differ by group. This would be like a residualized change score.
Paul R. Swank, Ph.D.
Professor, Department of Pediatrics
Medical School
Adjunct Professor, Health Promotions and Behavioral Sciences
School of Public Health
University of Texas Health Science Center at Houston
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Sent: Tuesday, August 14, 2012 11:30 AM
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Subject: Re: Analyses - Confused
Thank you. I will look into the ancova.
Would it not make sense to do a split file on IV, and paired t test? I am wondering if it is better to use the most parsimonious analysis. There is no missing data.
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