METHODOLOGY OF MEASUREMENT





The measurement of a property may be categorized by the following criteria: type, magnitude, unit, and uncertainty.[citation needed] They enable unambiguous comparisons between measurements.
  • The level of measurement is a taxonomy for the methodological character of a comparison
  • . For example, two states of a property may be compared by ratio, difference, or ordinal preference. The type is commonly not explicitly expressed, but implicit in the definition of a measurement procedure.
  • The magnitude is the numerical value of the characterization, usually obtained with a suitably chosen measuring instrument.
  • A unit assigns a mathematical weighting factor to the magnitude that is derived as a ratio to the property of an artifact used as standard or a natural physical quantity.
  • An uncertainty represents the random and systemic errors of the measurement procedure; it indicates a confidence level in the measurement. Errors are evaluated by methodically repeating measurements and considering the accuracy and precision of the measuring instrument.

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