Alternative Equation Formats

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MathML

\begin{aligned} {\hat{σ}}^{2} & = \frac{1}{n - r a n k (X)} {(Y - X \hat{β})}^{'} (Y - X \hat{β}) \\ = S S R / (n - r a n k (X)) \end{aligned}

Math Rendered as SVG

Math as LaTeX Source

\begin{align*} \widehat{\sigma }^2 & = \frac{1}{n-\mr{rank}(\bX )} \left(\bY -\bX \widehat{\bbeta }\right)' \left(\bY -\bX \widehat{\bbeta }\right) \\ & = \mr{SSR}/(n-\mr{rank}(\bX )) \end{align*}