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Scales used to express measurements. Usually ratio, interval, ordinal or nominal types of scales are recognized. Dichotomous and count types are sometimes seen as their own. Other classifications exist. [For "scale" as a sum of individual items in psychometry - see also tag 'psychometrics'.]

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The question about the `true' nature of a scale is indeed a tricky one. But a quick pragmatic answer is that, depending on the analysis that you are interested in running, it might be fairly straight …
answered Oct 8 '13 by David
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The PCM will accommodate the variation of the different rating scales without problem. … A second more stringent step would be to use the Rating Scale Model (RSM; Andrich, 1978) which would allow you to treat both scales as 'true' rating scales (i.e., the size of the 'steps' are shared across …
answered Feb 14 '12 by David
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I am not sure about the context of your analysis, but usually Likert scales are aggregated within subjects.] …
answered Jan 1 '12 by David
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Stevens "On the Theory of Scales of Measurement", where he lays out what is now considered a commonplace definition throughout psychology and psychometrics: "Measurement, in the broadest sense, is defined … Based on these distinctions, Stevens introduced in this paper the taxonomy of scales of measurement that includes Nominal, Ordinal, Interval and Ratio scales based on their mathematical group structure …
answered Nov 21 '14 by David