1. Unit 6: Analysis of Variance (ANOVA) Lesson 2: Computing Post Hoc Tests and Effect Sizes EDER 6010: Statistics for Educational Research Dr. J. Kyle Roberts University of North Texas I know they’re different, but where?? Next Slide
2. Post Hoc Tests ANOVA only tells if there is a difference Post Hoc tests tell specifically where these differences lay Next Slide
3. Running Post Hocs in SPSS 2 Variables: Grouping Variable Score Variable Next Slide 5 3 8 7 7 1 5 7 7 2 3 8 8 5 9 7 8 6 7 9 White Hispanic Black Asian
4. Running an ANOVA in SPSS Analyze Compare Means One-Way ANOVA Next Slide
7. Effect Size Measures Next Slide Eta-squared – the percent variance accounted for by the factor (way) of the dependent variable How good is our way at describing the variation in the dependent variable?
8. Effect Size 2 = .513 Percent variance explained Next Slide Score variable SS = 101.80 Ethnicity SS = 52.20
9. Unit 6: Analysis of Variance (ANOVA) Lesson 2: Computing Post Hoc Tests and Effect Sizes EDER 6010: Statistics for Educational Research Dr. J. Kyle Roberts University of North Texas I know they’re different, but where??
