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Stevens’ Four Scales of Measurement: The Addition of a New Scale
Bruce Ratner, Ph.D.
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Stevens' classification of four scales of measurement is widely used by statisticians, data analysts, and the everyday data mechanics. However, it is by no means universally accepted. [1, 2]

I for one need an addition to Stevens’ classification: Nominal, Categorical, Ordinal, Interval, and Ratio.

The purpose of this article is to briefly review Stevens’ scales of measurement and propose the addition of the categorical scale.
For the article, click here.

For more information about this article, call Bruce Ratner at 516.791.3544 or 1 800 DM STAT-1; or e-mail at
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