prove 327 and 328 78 3 Basic Investment Models and Their Sta

78 3 Basic Investment Models and Their Statistical Analysis Where E(Et) = 0, Cov (Et) = V, and E (xt Et) = 0. Note that (3.24) is a multivariate representation of q regression models of the form yti = aj + xt Beta j + etj, j = 1,?q. Letting x = n^-1 Sigma n t = 1 xt and y = n^-1 Sigma n t = 1 yt the OLS estimates of alpha and beta are given by

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this is from advance math, please put in a correct subject