The mean of the square of the differences of the forecasts and observations For mean square error, the variable in the definition of mean is (f-x)2, where f refers to forecasts and x refers to observations The mean square error is a measure of forecast accuracy The lower the mean square error, the more accurate the forecasts
The square root of the average square of the instantaneous values of an AC output For a sine wave the RMS value is 0 707 times the peak value The equivalent value of AC current, I, that will produce the same heating in a conductor with resistence, R, as a DC current of value I the corrosion of the protected structure
The effective amplitude of alternating current relative to direct current RMS values may refer to voltage levels or current levels, and is equal to 0 707 times the peak value
Square root of the mean square value of a random variable Rupture front The instantaneous boundary between the slipping and locked parts of a fault during an earthquake Rupture in one direction on the fault is referred to as unilateral Rupture may radiate outward in a circular manner or it may radiate toward the two ends of the fault from an interior point, behavior referred to as bilateral Rupture velocity The speed at which a rupture front propagates during an earthquake S wave A seismic body wave that involves a shearing motion in a direction perpendicular to the direction of propagation When it is resolved into two orthogonal components in the plane perpendicular to the direction of propagation, SH denotes the horizontal component and SV denotes the orthogonal component
- Square root of the arithmetical average of a set of squared instantaneous values DSAs perform rms averaging digitally on successive vibration spectra, frequency line by frequency line
A measure of the amount of "unexplained" variation remaining when a set of tics or control points are registered A polynomial regression equation is fitted to relate the digitizer coordinates to real-world coordinates
[ 'mEn ] (verb.) before 12th century. Middle English menen, from Old English m[AE]nan; akin to Old High German meinen to have in mind, Old Church Slavonic meniti to mention.