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MathML

\hat{COV} (\hat{β} (τ)) = {\begin{cases} ω^{2} (τ, F) Ω^{- 1} / n & for a linear model with iid errors \\ τ (1 - τ) H_{n}^{-} Ω H_{n}^{-} / n & for a linear-in-parameter model with non-iid settings \end{cases}

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Math as LaTeX Source

\[ \widehat{\mbox{COV}}\left(\hat{\bbeta }(\tau )\right)=\left\{ \begin{array}{l l} \omega ^2(\tau , F)\bOmega ^{-1}/n & \mbox{for a linear model with iid errors}\\ \tau (1-\tau )\mb{H}_ n^{-}\bOmega \mb{H}_ n^{-}/n & \mbox{for a linear-in-parameter model with non-iid settings} \end{array} \right. \]