Covariance
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In probability theory and statistics, covariance is a measure of how much two variables change together.
Where where is the Expected Value of X.
In probability theory and statistics, covariance is a measure of how much two variables change together.
![{\displaystyle {Cov}(X,Y)={E}{\big [}XY{\big ]}-{E}[X]\cdot {E}[Y]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d88cefcdba8816b287a1bdf5f0fa8c5c2457d559)
Where where ![{\displaystyle {E[}X]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b0b71db99b72f0ac70a22e055799eedefcd1502a)
