Alternative Equation Formats

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MathML

\hat{ϕ} = \sum_{i = 1}^{n} \frac{f_{i} (y_{i} - {\hat{y}}_{i})^{2}}{f - k}

\[ \widehat{\phi } = \sum _{i=1}^ n \frac{ f_ i (y_ i - \widehat{y}_ i)^2}{f - k} \]