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Results tagged with cohens-d
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user 180502
Cohen's d is a generalized effect size measure. It is the difference between two group means scaled by the combined standard deviation. Cohen's d is used frequently in Jacob Cohen's text on power analysis, mostly to simplify the presentation of tables.
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Power calculations using pilot effect sizes
Pilot sample sizes can yield inflated effect size estimates. After conducting a pilot I have found the 95% confidence interval on my effect to have a wide range due to the small sample size.
How doe …
- 823
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How can I compute a confidence interval on Cohen's d derived from a Tukey HSD contrast?
Question Background
Consider for example that I have some data arrayed as a 1-way (Group: A, B, C, D) between groups ANOVA.
Consider further that I am interested in all possible pairwise contrasts …
- 823