FactorialANOVA

# FactorialANOVA - df for denominator. Example 1: 2 kinds of...

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2-Way ANOVA

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Learning Objectives Compute 2-Way ANOVA by hand Calculate sums of squares for main effects  and interaction Complete ANOVA source table Correctly interpret results Compute 2-Way ANOVA using SPSS Correctly interpret output
ANOVA Partitions Variance Total variance is divided into Within groups – individual differences,  nuisance variance, error random error With 2-Way ANOVA, you have 2 IVs  instead of 1.  Variance between groups is  partitioned into 2 Main Effects and an  Interaction.

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ANOVA Significance Test ANOVA with 1 IV has 1  F  test ANOVA with multiple IVs has multiple  F  tests,  one for each Main Effect and one for each  Interaction. With 2-Way ANOVA, there are two main effects  and 1 interaction, so there are 3  F  tests.  All,  some, or none may be significant.  Critical  values change depending on

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Unformatted text preview: df for denominator. Example 1: 2 kinds of Therapies Treatment of panic attacks. IV1: psychotherapy. 3 levels: conventional, experimental, and control (wait list). IV2: Anti-anxiety drug. 2 levels: drug vs. control. DV is number of panic attacks during 1 week after 6 wks therapy. See handout for data. Work thru example. Example 2: Types of training Military electronic troubleshooters fix radar, missile guidance systems, etc. Standard training is experience with common problems. New training. on top of standard training. IV1: Theory of electronics (new module). IV2: Practice of troubleshooting (new module). Work thru handout. SPSS Download file. Run SPSS & match to hand computations. Produce a graph of the cell means....
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## This note was uploaded on 05/21/2011 for the course PSY 3213 taught by Professor Staff during the Fall '08 term at University of South Florida - Tampa.

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FactorialANOVA - df for denominator. Example 1: 2 kinds of...

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