Correlation coefficient

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$\includegraphics[height=10mm]{images/rhoCorrelationCoefficient}% WIDTH=48 HEIGHT=45$

The operator can be placed on the canvas in two ways:

From the Statistics (``statistics'') toolbar $\resizebox{!}{2ex}{\includegraphics{images/mean}}% WIDTH=15 HEIGHT=14$ ; or
By typing the letters ``correlation'' on the canvas and then pressing the Enter key

See covariance for the interpretation of tensor valued arguments. The correlation coefficient is defined as

$\begin{displaymath} \rho(x,y)=\frac{\mathrm{cov(x,y)}}{\sigma(x)\sigma(y)} \end{displaymath}% WIDTH=270 HEIGHT=79$