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Line 4: ==Formal definition== Suppose we are given a regression function ~~''&fnof;''~~<math>f(.)</math> yielding for each <math>y_i</math> an estimate <math>\widehat{y}_i = f(x_i)</math> where <math>x_i</math> is the vector of the ''i''<sup>th</sup> observations on all the explanatory variables. We define the fraction of variance unexplained (FVU) as: :<math>\begin{align}

Fraction of variance unexplained: Difference between revisions