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When comparing a new method of measurement with a standard method, one of the things we want to know is whether the difference between the measurements by the two methods is related to the magnitude of the measurement. A plot of the difference against the standard measurement is sometimes suggested, but this will always appear to show a relation between difference and magnitude when there is none. A plot of the difference against the average of the standard and new measurements is unlikely to mislead in this way. We show this theoretically and by a practical example.

Type

Journal article

Journal

Lancet

Publication Date

21/10/1995

Volume

346

Pages

1085 - 1087

Keywords

Bias, Humans, Reference Standards, Reference Values, Statistics as Topic, Weights and Measures