Alternative Equation Formats
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\[ w_{gj} = \left\{ \begin{array}{ll} \frac{N_{g}}{N_{gt}} & \mbox{for treated units in the}~ g\mbox{th matched set} \\ \frac{N_{g}}{N_{gc}} & \mbox{for control units in the}~ g\mbox{th matched set} \end{array} \right. \]
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