Alternative Equation Formats

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MathML

\begin{array}{rcl} L & = & \sum_{{i : y_{i} = 0}} \ln {Φ (z_{i}^{'} γ) + [1 - Φ (z_{i}^{'} γ)] \exp (- \exp (x_{i}^{'} β))} \\ + & \sum_{{i : y_{i} > 0}} {\ln [(1 - Φ (z_{i}^{'} γ))] - \exp (x_{i}^{'} β) + y_{i} x_{i}^{'} β - \sum_{k = 2}^{y_{i}} \ln (k)} \end{array}

MathML rendered with MathJax

\begin{array}{rcl} L & = & \sum_{{i : y_{i} = 0}} \ln {Φ (z_{i}^{'} γ) + [1 - Φ (z_{i}^{'} γ)] \exp (- \exp (x_{i}^{'} β))} \\ + & \sum_{{i : y_{i} > 0}} {\ln [(1 - Φ (z_{i}^{'} γ))] - \exp (x_{i}^{'} β) + y_{i} x_{i}^{'} β - \sum_{k = 2}^{y_{i}} \ln (k)} \end{array}

Math as LaTeX Source

\begin{eqnarray*} \mathcal{L} & = & \sum _{\{ i: y_{i}=0\} } \ln \left\{ \Phi (\mathbf{z}_{i}'\bgamma ) + \left[ 1- \Phi (\mathbf{z}_{i}'\bgamma )\right] \exp (-\exp (\mathbf{x}_{i}'\bbeta )) \right\} \\ & + & \sum _{\{ i: y_{i}>0\} } \left\{ \ln \left[ \left( 1-\Phi (\mathbf{z}_{i}'\bgamma )\right) \right] - \exp (\mathbf{x}_{i}'\bbeta ) + y_{i} \mathbf{x}_{i}'\bbeta - \sum _{k=2}^{y_{i}} \ln (k) \right\} \end{eqnarray*}