Alternative Equation Formats
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MathML
MathML rendered with MathJax
Math as LaTeX Source
\[ r_{xy}=\frac{\sum _ i \, w_ i(x_ i-\bar{x}_ w)(y_ i-\bar{y}_ w)}{\sqrt {\sum _ i w_ i(x_ i-\bar{x}_ w)^2 \, \sum _ i w_ i(y_ i-\bar{y}_ w)^2}} \]