PSYC227_fall09_ANOVA_repMeas-2way-handout

PSYC227_fall09_ANOVA_repMeas-2way-handout - 1 Analysis of...

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Unformatted text preview: 1 Analysis of Variance ANOVA More than 2 groups ANOVA SOURCE SS df MS F Between SS b df b MS b =SS b /df b F=MS b / MS w Within SS w df w MS w =MS w /df w Total SS total = SS b + SS w df total = df b + df w F-distribution, depends on df b , df w. Error term Repeated-Measures ANOVA Learning Objectives Be able to explain the logic of repeated-measures ANOVA Understand what sources of variability is partitioned and what sources of variability contribute to each component Know the di f erences between the analysis for repeated- vs. independent- measures design Be able to perform the computations for a complete analysis Be able to compute the measure of e f ect size for the repeated-measures ANOVA Repeated-measures ANOVA Repeated measures study : single sample of individuals is measures more than once on the same dependent variable M e a s u r e s a m e in d iv id u a ls m o r e th a n tw ic e Repeated measures Repeated measures How many scores per person or how many treatment conditions? t w o m o r e t h a n t w o Related samples t-test Repeated- measures ANOVA Repeated-Measures ANOVA Residual/error variance: How much variance is to be expected by chance after the individual differences have been removed. The partitioning of variance for a repeated-measures experiment. ANOVA ANOVA Example: The e f ect of drug treatment on the amount of time (in seconds) a stimulus is endured. Total number of scores Person totals Example: The e f ect of drug treatment on the amount of time (in seconds) a stimulus is endured. subjects Example: The e f ect of drug treatment on the amount of time (in seconds) a stimulus is endured....
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PSYC227_fall09_ANOVA_repMeas-2way-handout - 1 Analysis of...

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