Show that the modified factor model with E[F q ] = ?F q , Cov[F p ,

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Show that the modified factor model

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with E[Fq] = ?Fq, Cov[Fp, Fq] = ?pq, Cov [Fq, ?n] = 0, E [?n] = 0, AND COV [?m , ?n]= ?mn?2n, generates the correct APT-equation (7.57).

(7.57)

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