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Discan is both a scale and a method in clinical psychology. As a scale, it is a type of ordered-metric scaling that yields a scale with internal reliability, and scale-points in excess of the number of initial anchors, more than would be the case with the Likert scale, though not as many as are achieved by the Analog scale.
For example, four descriptive anchor-levels yield 14 scale-points. In Louis Thurstone's tradition, it is scored by paired-comparisons. Seeking optimality, it is a compromise between the competing merits and demerits of the Likert scale and the Analog scale. Its use in clinical psychology derives from the influence of the late M.B. Shapiro.
For more detail, see Nomothetic and Idiographic
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