dynamic properties on the same discrete argument ()
{\rm cov}(x,y) = \frac{1}{n} \sum_{i=1}^n (x_i - \bar x) (y_i - \bar y) |
cross-property covariance
\sigma(x) = \sqrt { \frac{1}{n} \sum_{i=1}^n (x_i - \bar x)^2 } |
\sigma(y) = \sqrt { \frac{1}{n} \sum_{i=1}^n (y_i - \bar y)^2 } |
standard deviation of property