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A Priori Power Analysis

Whether you're planning your study or working with existing data — we'll determine the right sample size and validate your statistical power.

  • Optimal sample size calculation

  • Power validation with your existing data

  • Delivered within hours, even minutes

Feeling stuck or need a hand? Let's fill the form out together in a short video

Describe your study briefly in your own words. What's the goal, and who are you studying?

How does the comparison work? How many groups are there, or will you measure the same people before and after?

The one core measurement your study is really built to answer — the one that shows whether it succeeded. Ideally one; separate multiple with commas.

Pick one if you have a sense of it; if not, we'll estimate it for you.

Add them if any; not required for the calculation.

Please share only studies that closely match yours. Studies with a different population, measurement method, or outcome can't be used reliably in the power calculation and may skew the result.

Reference studies(optional)

Upload the 1-3 closest papers as PDF or Word.

Your pilot / preliminary data(optional)

If you have pilot or preliminary data, upload it — we'll estimate the variability for you.

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