What do a.m. and p.m. stand for?

mean square

noun, Statistics.
the mean of the squares of a set of numbers.
Origin of mean square
1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mean square
  • 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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