es.d: Cohen d effect size calculation for one or two means

In powertools: Power and Sample Size Tools

Cohen d effect size calculation for one or two means

Description

This function takes as inputs a difference between two means and a standard deviation and outputs the d effect size as defined by Cohen (1988), also called the standardized mean difference.

Usage

es.d(delta = NULL, sd = 1)

Arguments

delta	If one mean: muA (the true mean) - mu0 (the mean under the null). If two means: DeltaA (the true difference mu1 - mu2) - Delta0 (the difference under the null).
sd	The estimated standard deviation; defaults to 1.

Details

Cohen J (1988) Statistical Power Analysis for the Behavioral Sciences, 2nd edition. Lawrence Erlbaum Associates, Hillsdale, New Jersey

Value

A list of the arguments and the d effect size.

Examples

es.d(delta = 6.5 - 5.7, sd = 0.4)

powertools documentation built on April 4, 2025, 5:02 a.m.