mean square

noun Statistics.
the mean of the squares of a set of numbers.

Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The root mean square error of approximation values was robust in the presence of kurtosis for the elliptical estimation methods.
The mean square is the sum of squares divided by the number of degrees of freedom.
The root mean square error and bias is within the accuracy considered to be satisfactory.
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