Often when people learn about effect sizes, one of the first things they ask is “what software do I need to do this?”

Many effect size indexes can be calculated on the back of an envelope or using nothing more than a Spreadsheet.

Other effect size indexes are generated automatically by statistical programs such as SPSS or STATA.

Still, for those of you who want something flashy, a set of seven easy to use calculators can be found on the Resources page (or just click here to be taken straight to the calculators).

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“The primary product of a research inquiry is one or more measures of effect size, not p values.”
~ Jacob Cohen

How to manuals

“Statistical significance is the least interesting thing about the results. You should describe the results in terms of measures of magnitude – not just, does a treatment affect people, but how much does it affect them.”
~ Gene Glass