January 27, 2012

How much data is enough?

How do you know when you have collected enough data for a project?

Do you collect data until ...
you pass a criteria set before the start?
you pass an arbitrary statistical significance test?
you find something interesting?
you find something meaningful?
you run out of resources (i.e., money, time, or subject pool)?
you satisfy every reviewer?
you get published?

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