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PSYC227_fall09_ANOVA_repMeas-2way-handout

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

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1 Analysis of Variance ANOVA

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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

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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 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 ect size for the repeated-measures ANOVA Repeated-measures ANOVA

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Repeated measures study : single sample of individuals is measures more than once on the same dependent variable Measure same individuals more than twice
Repeated measures Repeated measures How many scores per person or how many treatment conditions? two more than two Related samples t-test Repeated- measures ANOVA

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Repeated-Measures ANOVA Residual/error variance: How much variance is to be expected by chance after the individual differences have been removed.

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The partitioning of variance for a repeated-measures experiment.
ANOVA

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ANOVA
Example: The e ect of drug treatment on the amount of time (in seconds) a stimulus is endured. Total number of scores Person totals

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Example: The e ect of drug treatment on the amount of time (in seconds) a stimulus is endured. subjects
Example: The e 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 - Analysis of...

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