# mean-square deviation

## mean-square deviation

[′mēn ′skwer dē·vē′ā·shən] (statistics)

A measure of the extent to which a collection

*v*_{1},*v*_{2}, …,*v*_{n }of numbers is unequal; it is given by the expression (1/*n*)[(*v*_{1}- v̄)^{2}+ ⋯ + (*v*_{n }- v̄)^{2}], where v̄ is the mean of the numbers.Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

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