mean square deviation
Mean Mean, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus that is in the middle, fr. medius; akin to E. mid. See {Mid}.] 1. Occupying a middle position; middle; being about midway between extremes. [1913 Webster]

Being of middle age and a mean stature. --Sir. P. Sidney. [1913 Webster]

2. Intermediate in excellence of any kind. [1913 Webster]

According to the fittest style of lofty, mean, or lowly. --Milton. [1913 Webster]

3. (Math.) Average; having an intermediate value between two extremes, or between the several successive values of a variable quantity during one cycle of variation; as, mean distance; mean motion; mean solar day. [1913 Webster]

{Mean distance} (of a planet from the sun) (Astron.), the average of the distances throughout one revolution of the planet, equivalent to the semi-major axis of the orbit.

{Mean error} (Math. Phys.), the average error of a number of observations found by taking the mean value of the positive and negative errors without regard to sign.

{Mean-square error}, or {Error of the mean square} (Math. Phys.), the error the square of which is the mean of the squares of all the errors; -- called also, {mean square deviation}, {mean error}.

{Mean line}. (Crystallog.) Same as {Bisectrix}.

{Mean noon}, noon as determined by mean time.

{Mean proportional} (between two numbers) (Math.), the square root of their product.

{Mean sun}, a fictitious sun supposed to move uniformly in the equator so as to be on the meridian each day at mean noon.

{Mean time}, time as measured by an equable motion, as of a perfect clock, or as reckoned on the supposition that all the days of the year are of a mean or uniform length, in contradistinction from apparent time, or that actually indicated by the sun, and from sidereal time, or that measured by the stars. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• mean square deviation — noun Date: 1920 1. variance 5 2. standard deviation …   New Collegiate Dictionary

• mean square deviation — noun : standard deviation * * * Statistics. variance (def. 3). [1890 95] …   Useful english dictionary

• mean square deviation — Statistics. variance (def. 3). [1890 95] * * * …   Universalium

• Root-mean-square deviation — For the application of root mean square deviation to bioinformatics, see Root mean square deviation (bioinformatics). The root mean square deviation (RMSD) or root mean square error (RMSE) is a frequently used measure of the differences between… …   Wikipedia

• Root mean square deviation — The root mean square deviation (RMSD) ( also root mean square error (RMSE) ) is a frequently used measure of the differences between values predicted by a model or an estimator and the values actually observed from the thing being modeled or… …   Wikipedia

• Root mean square deviation (bioinformatics) — The root mean square deviation (RMSD) is the measure of the average distance between the backbones of superimposed proteins. In the study of globular protein conformations, one customarily measures the similarity in three dimensional structure by …   Wikipedia

• root-mean-square deviation — noun : standard deviation * * * root mean square deviation «ROOT MEEN SKWAIR», = standard deviation. (Cf. ↑standard deviation) …   Useful english dictionary

• root-mean-square deviation — vidutinis kvadratinis nuokrypis statusas T sritis automatika atitikmenys: angl. root mean square deviation vok. mittlere quadratische Abweichung, f rus. среднеквадратическое отклонение, n pranc. écart moyen quadratique, m …   Automatikos terminų žodynas

• experimental root-mean-square deviation — eksperimentinis vidutinis kvadratinis nuokrypis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. experimental root mean square deviation vok. mittlere quadratische …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• root-mean-square deviation — vidutinis kvadratinis nuokrypis statusas T sritis fizika atitikmenys: angl. root mean square deviation vok. mittlere quadratische Abweichung, f rus. средне квадратичное отклонение, n pranc. écart moyen quadratique, m; écart quadratique moyen, m …   Fizikos terminų žodynas