Measurement is the process of experimentally obtaining a numerical value of magnitude for a characteristic that can be attributed to an object or event within a frame of reference that permits comparison with other objects or events.[1]
Nominal properties, meaning properties that have no magnitude, are not included in the definition.
In statistics and quantitative research methodology, various attempts have been made to classify variables (or types of data) and thereby develop a taxonomy of levels of measurement or scales of measure.
Perhaps the best known are those developed by the psychologist Stanley Smith Stevens.
He proposed four types: nominal, ordinal, interval, and ratio.
In mathematical analysis, a measure on a set is a systematic way to assign a number to each suitable subset of that set, intuitively interpreted as its size.
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