mean-square deviation

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mean-square deviation [′mēn ′skwer dē·vē′ā·shən]

(statistics)

A measure of the extent to which a collectionv₁,v₂, …,v_nof numbers is unequal; it is given by the expression (1/n)[(v₁- v̄)²+ ⋯ + (v_n- v̄)²], where v̄ is the mean of the numbers.

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