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Can someone explain to me how
Cov(x,y)=[X-E(x))(Y-E(y)]
and this would equal 0 under the normal OLS assumption.
I know how to calculate the covariance, but X here is a matrix. So I don't understand the logic of this formula...
Cov(x,y)=[X-E(x))(Y-E(y)]
and this would equal 0 under the normal OLS assumption.
I know how to calculate the covariance, but X here is a matrix. So I don't understand the logic of this formula...