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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).

None: FAQ/power/unpeg (last edited 2013-03-08 10:17:18 by localhost)