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Effect Size Calculator
A p-value tells you whether an effect is there; an effect size tells you how big it is. Choose from 8 standardized measures -- covering independent and paired means, 2×2 tables, two proportions, and one-way ANOVA -- and get a point estimate, confidence interval, and a plain-language small/medium/large read.
Effect Size Calculator
Type in the summary statistics you already have -- compute a standardized effect size, its confidence interval (where a standard formula exists), and a small/medium/large qualitative read using Cohen's (1988) benchmarks.
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