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Notes8 - 1 ANOVA 1 Introduction to Analysis of Variance...

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Unformatted text preview: 1 ANOVA 1 Introduction to Analysis of Variance (ANOVA) ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ What is ANOVA? ANOVA is short for ANalysis Of VAriance Used with 3 or more groups. E.g., caffeine study with 3 groups: No caffeine Mild dose Jolt group Level is value, kind or amount of IV Treatment Group is people who get specific treatment or level of IV ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Example Designs for ANOVA VGP Performance DV: Video Game G1 Drug 2 G1 Drug 1 Grp1 Saline design) (within subjects Repeated Measures Points won 1 st match Points won 1 st match DV: points won 1 st match 3 matches/wk + visualization + ritual G3 3 matches/wk +visualization G2 IV: 3 matches/wk G1 Design Subjects Between ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 2 Repeated Measures Each Person Gets All Treatments Advantages of repeated measures: 1. Control for individual differences. 2. Reduced number of participants. Disadvantages: 1. Cannot always be done, e.g., sex as IV, lottery winnings as IV. 2. Reactions to treatments carryover or contrast effects (racquetball example, surveys). ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Choosing a Design: 1. The number of Groups Use 2 groups when the study contrasts something as a whole (e.g., type of psychotherapy, workbook, flight instruction) Use 3 or more groups when The IV has lots of levels, e.g., race, geog location, therapies for phobias Treatments can be broken into meaningful pieces (training for racquetball, training for RM includes labs, workbooks, computers, etc.) Continuous variables are reduced to levels for economy (dating service similarity to hi, med, low). ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Choosing a design 2: Between vs. Within Subjects In between subjects designs, different people go to different groups. In within subjects designs, people go to multiple treatments....
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Notes8 - 1 ANOVA 1 Introduction to Analysis of Variance...

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