Alternative Equation Formats

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MathML

\sum_{i = 1}^{N} \sum_{t = 1}^{T_{i}} \frac{{\hat{ϵ}}_{i t}^{2}}{(1 - {\hat{h}}_{i t})^{2}} x_{i t} x_{i t}^{^{'}} + 2 \sum_{i = 1}^{N} \sum_{t = 1}^{T_{i}} \sum_{s = 1}^{t - 1} \frac{{\hat{ϵ}}_{i t}}{1 - {\hat{h}}_{i t}} \frac{{\hat{ϵ}}_{i s}}{1 - {\hat{h}}_{i s}} (x_{i t} x_{i s}^{^{'}} + x_{i s} x_{i t}^{^{'}})

Math Rendered as SVG

Math as LaTeX Source

\[ \sum _{i = 1} ^{N} \sum _{t=1}^{T_ i} \frac{\hat{\epsilon }_{it} ^{2}}{(1 - \hat{h}_{it})^2}\mb{x} _{it} \mb{x} _{it} ^{'} +2\sum _{i = 1} ^{N} \sum _{t=1}^{T_ i} \sum _{s=1}^{t-1} \frac{\hat{\epsilon }_{it}}{1 - \hat{h}_{it}}\frac{\hat{\epsilon }_{is}}{1 - \hat{h}_{is}} \left(\mb{x} _{it} \mb{x} _{is} ^{'} + \mb{x} _{is} \mb{x} _{it} ^{'}\right) \]