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Statistical power calculator

The power a study already has, given its sample size and the effect it was looking for.

Chosen independently of your data. Using the effect you observed makes this uninformative.

Nothing you enter is stored or sent anywhere. The calculation runs for this request and is then gone.

Before you use this

Fill in the form and the result appears here, along with every intermediate value and a note on what the number does not mean.

These calculators run on the server with a plain form post, so they work with JavaScript disabled and nothing is sent to a third party.

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