User talk:Bigbellmercy

Covariances
Unfortunately, this edit of yours is wrong. cov(X,Y) and cov(Y,X) are the same if X and Y are scalar-valued random variables, but these are vectors. cov(X,Y) and cov(Y,X) are transposes of each other. They are not in general the same. Michael Hardy (talk) 04:40, 28 May 2019 (UTC)