Alternative Equation Formats

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MathML

\frac{1}{W} \sum_{i} f_{i} w_{i} (r_{i} (1 - {\hat{π}}_{i})^{2} + (n_{i} - r_{i}) {\hat{π}}_{i}^{2})

$\frac{1}{W}\sum _ if_ iw_ i(r_ i(1-\widehat{\pi }_ i)^2+(n_ i-r_ i)\widehat{\pi }_ i^2)$