Calculate and display CIs for standardised effect sizes (Cohen's d), for One and Two Group designs. Requires use of NonCentral t distributions.

Enter your data for Case 1, Single Group (pictured), or Case 2, Two Independent Groups. The dotplot and CI are shown, in original units, as in CIoriginal. Set a µo comparison value, which serves as the zero for measurement of Cohen’s d, the standardised effect size. Click to display the CI for d, but note that this is not yet accurate. To find accurate values, the red noncentral t distributions must be positioned so that their tails that overlap d are of size [alpha/2]. To achieve this you can move the sliders, or you can click the buttons to have Excel do the work. For more, see our journal article.