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MEAN SQUARE DEVIATION

Statistics Directorate    
French Equivalent: Déviation en moyenne

Definition:
The second moment of a set of observations about some arbitrary origin. If that origin is the mean of the observations the mean square deviation is the equivalent of the variance.

Context:
An equivalent expression, especially when the observations are variate values, is mean square error. This latter term also occurs in older writings in the sense of variance but should not be employed in that sense.

Source Publication:
A Dictionary of Statistical Terms, 5th edition, prepared for the International Statistical Institute by F.H.C. Marriott. Published for the International Statistical Institute by Longman Scientific and Technical.

Statistical Theme: Methodological information (metadata)

Created on Tuesday, May 21, 2002

Last updated on Wednesday, April 07, 2004