Alternative Equation Formats

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MathML

\begin{array}{rcl} {\hat{V a r}}_{h} ({\hat{P}}_{r c}) & = & \frac{n_{h} (1 - f_{h})}{n_{h} - 1} \sum_{i = 1}^{n_{h}} (e_{r c}^{h i} - {\bar{e}}_{r c}^{h})^{2} \\ e_{r c}^{h i} & = & (\sum_{j = 1}^{m_{h i}} (δ_{h i j} (r, c) - {\hat{P}}_{r c}) W_{h i j}) / \hat{N} \\ {\bar{e}}_{r c}^{h} & = & (\sum_{i = 1}^{n_{h}} e_{r c}^{h i}) / n_{h} \end{array}

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Math as LaTeX Source

\begin{eqnarray*} \widehat{\mr{Var}}_ h(\widehat{P}_{rc}) & =& \frac{n_ h(1-f_ h)}{n_ h-1} ~ \sum _{i=1}^{n_ h} (e_{rc}^{~ hi} - \bar{e}_{rc}^{~ h})^2 \\ e_{rc}^{~ hi} & =& \left( \sum _{j=1}^{m_{hi}} ~ ({\delta _{hij} (r,c) - \widehat{P}_{rc}) ~ W_{hij}} \right) ~ / ~ \widehat{N} \\[0.1in] \bar{e}_{rc}^{~ h} & =& \left( \sum _{i=1}^{n_ h} ~ {e_{rc}^{~ hi}} \right) ~ / ~ n_ h \end{eqnarray*}