Shepard diagram

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A plot of two measurements of the distances between objects. One measurement is the true distance, and the other measurement is the apparent distance in some representation of the objects. For example, the apparent distance between objects in a photograph (two dimensions) and the real three-dimensional distance. The diagram is used in multidimensional scaling to assess the extent of any distortion. Zero distortion would correspond to a set of collinear points.

Subjects: Probability and Statistics.

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