Binary scale

Related to Binary scale: Ordinal scale
(Arith.) a uniform scale of notation whose ratio is two.

See also: Binary

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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(18) Assessment of diagnostic performance is often focused on the accuracy of classifying subjects with a known true status on a binary scale. Diagnostic results can be based on a binary rating scale, an ordinal rating scale, or a continuous rating scale.
Consider a hypothetical example of two raters giving ratings for n subjects on a binary scale, with '1' representing a positive result (e.g., the presence of a diagnosis) and '0' representing a negative result (e.g., the absence of a diagnosis).
Respondents answered on a binary scale. In years 6-9, PTSD was evaluated with the original version of the PCL-C, which contains 17 items and which respondents answered on Likert scale.
Something can belong to two or more sets - on a binary scale of 0 to 1.
All complicated matters of life, according to this way of thinking, can be reduced to a simple binary scale: Press your thumb down on the bad end, and the good one will go up.