# Example Input using Cohen's d

Some t-test effect sizes are presented in terms of d. d is the difference between two means in terms of standard deviations.

For example for a d of 1 can be inputted into the WIKI programs using mean 1 = 1, mean 2 = 0 and their common SD = 1 (since 1-0 divided by 1=1). Equivalently a d of 1 also corresponds to entering means of 20 and 19.5, with a SD of 2 (since 20-19.5 divided by 2=1).