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19: Effect Size

Last updated

Apr 23, 2022
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- 18.10: Distribution Free Tests (Exercises)
- 19.1: Prelude to Effect Size

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19.1: Prelude to Effect Size
Researchers often seek to learn more than whether the variable under investigation has an effect and/or the direction of the effect. This is particularly true for research that has practical applications.
19.2: Proportions
Compute absolute risk reduction Compute relative risk reduction Compute number needed to treat
19.3: Difference Between Two Means
When the units of a measurement scale are meaningful in their own right, then the difference between means is a good and easily interpretable measure of effect size.
19.4: Proportion of Variance Explained
Effect sizes are often measured in terms of the proportion of variance explained by a variable. In this section, we discuss this way to measure effect size in both ANOVA designs and in correlational studies.
19.5: Statistical Literacy
19.6: Effect Size (Exercises)

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