Betere Dingen

| 29-04-2008 11:22Variance over measurements

A long time ago I made a proof for a formula that can be used to calculate the variance of two subpopulations without knowing the individual scores. What is needed is the variance, the average scores and the number of scores of all subpopulations, without the actual scores. This was used to decrease the size of a database. PDF-file.

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