\[M{\text{ }}Square = {\text{ }}\left( {Rp - Rf} \right)\frac{{\left( {Std{\text{ }}Dev{\text{ }}of{\text{ }}m} \right)}}{{\left( {Std{\text{ }}Dev{\text{ }}of{\text{ }}p} \right)}} - \left( {Rm - Rf} \right)\]
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