Alternative Equation Formats

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MathML

Λ_{H A C} = a \sum_{i = 1}^{N} \sum_{t = 1}^{T_{i}} {\hat{ϵ}}_{i t}^{2} x_{i t} x_{i t}^{^{'}} + a \sum_{i = 1}^{N} \sum_{t = 1}^{T_{i}} \sum_{s = 1}^{t - 1} k (\frac{s - t}{b}) {\hat{ϵ}}_{i t} {\hat{ϵ}}_{i s} (x_{i t} x_{i s}^{^{'}} + x_{i s} x_{i t}^{^{'}})

Math Rendered as SVG

Math as LaTeX Source

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