root mean square
Averaged squared magnitudes
Root mean square is a statistical measure calculated by squaring a set of values, finding their average, then taking the square root.
Abbreviated RMS.
It's especially useful for quantities that vary above and below zero, like alternating current voltage, where a simple average would be misleading: The RMS voltage of household current is about 120 volts.
Electrical potential difference
- currentDirected flow of charge
- ACElectrical current or cooling
- alternating currentPeriodically reversing electrical flow
- powerEnergy transfer rate
waveform · harmonic distortion · amplitude · frequency · impedance · resistance · reactance · circuit
Tenth of a bel
- audioTransmitted sound content
- loudnessPerceived sound intensity
- noiseUnwanted auditory disturbance
- vibrationRapid oscillating movement
oscillation · waveform · amplitude · frequency · microphone · peak · dynamic range · averaging
Spread around the mean
- standard deviationSpread around the mean
- deviationDeparture from expected path
- residualsOngoing compensation for rebroadcasts
- errorFault in communication
regression · ANOVA · correlation coefficient · normal distribution · confidence interval · t-test · sample size · estimator
Size or scale
- vectorQuantity with direction
- averageArithmetic mean or ordinary
- inequalityUnequal distribution of resources
- convergenceProcess of approaching sameness
summation · integration · continuous · discrete · weighted · expected value · norm
voltage
Electrical potential difference
- currentDirected flow of charge
- ACElectrical current or cooling
- alternating currentPeriodically reversing electrical flow
power · waveform · harmonic distortion · amplitude · frequency · impedance · resistance · reactance · circuit · oscilloscope
decibel
Tenth of a bel
vibration · oscillation · waveform · amplitude · frequency · microphone · peak · dynamic range · averaging · exposure
variance
Spread around the mean
- standard deviationSpread around the mean
- deviationDeparture from expected path
- residualsOngoing compensation for rebroadcasts
error · regression · ANOVA · correlation coefficient · normal distribution · confidence interval · t-test · sample size · estimator · bias
magnitude
Size or scale
- vectorQuantity with direction
- averageArithmetic mean or ordinary
- inequalityUnequal distribution of resources
convergence · summation · integration · continuous · discrete · weighted · expected value · norm
- averagesmedian, mode, average, weighted average, moving average
- gas physicsideal gas law, Boyle's law, Avogadro's law, gas laws, kinetic theory
- variabilityvariance, standard deviation, spread, dispersion, range
root mean squarearithmetic mean
Sum over count
arithmetic average · mean · geometric mean · median · mode
root, roots, rooted, rooting, rootless, mean, means, meant, meaning