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{{Merge to|Coefficient of determination|date=July 2013}}
{{Unreferenced|date=February 2007}}
{{broader|Explained variation}}
In [[statistics]], the '''fraction of variance unexplained (FVU)''' in the context of a [[Regression analysis|regression task]] is the fraction of variance of the [[regressand]] (dependent variable) ''Y'' which cannot be explained, i.e., which is not correctly predicted, by the [[explanatory variable]]s ''X''.
==Formal definition==
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