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# lecture17note - ANOVA TABLE Source Factor A df a-1...

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3/10/2010 1 Lecture 17 One-factor within subjects ANOVA 1 ANOVA TABLE Source df SS MS F Factor A a-1 SS A SS A /(a-1) MS A /MS error Factor B b-1 SS B SS B /(b-1) MS B /MS error Factor A×B (a-1)(b-1) SS A×B SS A×B /((a-1)(b-1)) MS A×B /MS error Error N-ab SS error SS error /(N-ab) Total N-1 SS Total 2 Interpretation 3 4 5 One-factor within-subjects analysis of variance In a one-factor within-subjects design , a single group of subjects is exposed to and measured in each level of the independent variable Also called a repeated measures design Used to analyze one-factor multilevel within- subjects designs It may also be used in place of t rel if only two levels of an independent variable are manipulated

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3/10/2010 2 One-factor within-subjects analysis of variance (continued) Partitions the total variation of scores in an experiment into three sources The variation due to the effect of factor A : treatment effect The variation due to the effect of factor S : individual differences among subjects The variation due to the interaction of the treatments with the subjects: symbolized as A S Example Suppose we are interested in the development of a flavor preference in rats. We do 12 days of conditioning in
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lecture17note - ANOVA TABLE Source Factor A df a-1...

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