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Experiments: Part 4 Main Effects

Experiments: Part 4 Main Effects. Overview. What is a factorial design? What is a main effect? How can one determine the number of factors, levels, conditions, and main effects present in a study? Reminder Make sure to keep up on the readings Get going on Paper 2 ASAP. Review.

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Experiments: Part 4 Main Effects

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  1. Experiments: Part 4Main Effects

  2. Overview • What is a factorial design? • What is a main effect? • How can one determine the number of factors, levels, conditions, and main effects present in a study? • Reminder • Make sure to keep up on the readings • Get going on Paper 2 ASAP

  3. Review • Factor vs. Level • Single-factor designs (previous) • Single-factor, two-level design • Single-factor, multi-level design • Factorial designs (today, next lecture, and Paper 2) • Two-factor design • Multi-factor design • Factor = categorical independent variable • Level = category within a factor • Condition = experimental group or cell

  4. Factorial Matrix

  5. Factorial Matrix

  6. Factorial Matrix What is the effect of anxiety (independent variable) upon math test performance (dependent variable)?

  7. Factorial Matrix

  8. Factorial Matrix

  9. Factorial Matrix

  10. Factorial Matrix

  11. Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  12. Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  13. Factorial Matrix What are the effects of mood and mortality salience on support for cigarette taxes?

  14. Notation • Factor = categorical independent variable • Level = category within a factor • Condition = experimental group or cell • Summarized using numbers • 2 x 3 • 2 x 4 x 8 • # of Factors = # of numbers • # of Levels on a factor = numbers themselves • # of Conditions = product of the numbers (do the math)

  15. Main Effects • Main effect when a factor (categorical independent variable) has an effect on the outcome (dependent variable) • Significant mean difference across levels of the factor • Can be as many main effects as there are factors • One factor: 0 or 1 main effects • Two factors: 0, 1, or 2 main effects, etc.

  16. Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  17. How many main effects? Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  18. How many main effects? Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  19. How many main effects? Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  20. How many main effects? Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

  21. How many main effects? Factorial Matrix What are the effects of anxiety and mortality salience on support for cigarette taxes?

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