Alternative Equation Formats

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MathML

X^{2} = \sum_{i} \frac{w_{i} (y_{i} - {\hat{μ}}_{i})^{2}}{a ({\hat{μ}}_{i})}

\[ X^2 = \sum _{i} \frac{w_ i (y_ i - \widehat{\mu }_ i)^2}{a(\widehat{\mu }_ i)} \]