Alternative Equation Formats

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MathML

\hat{ϕ} = \frac{1}{N - p} \sum_{i = 1}^{K} f_{i} \sum_{j = 1}^{n_{i}} e_{i j}^{2}

\[ \hat{\phi } = \frac{1}{N-p} \sum _{i=1}^ Kf_ i \sum _{j=1}^{n_ i} e_{ij}^2 \]