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:<math>\begin{align}
\text{FVU} & = {\text{VAR}_{\rm err} \over \text{VAR}_{\rm tot}} = {\text{SS}_{\rm err}/n \over \text{SS}_{\rm tot}/n} = {\text{SS}_{\rm err} \over \text{SS}_{\rm tot}} ( = 1-{\text{SS}_{\rm reg} \over \text{SS}_{\rm tot}} , \text{only true in some cases such as linear regression}) \\[6pt]
& = 1 - R^2,
\end{align}</math>
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