2013 CFAI Mock Q: 27 in PM Section
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I don’t quite understand why the variance gives the following formula
Var(M) = Var(F1) * (b1)^2 + Var(F2) * (b2)^2 + 2 * b1 * b2 * Cov (F1,F2) + Var (error)
Why are the beta’s squared and how do we calculate the error term here? Thanks. Continue reading