Article,

Comparing methods of measurement: why plotting difference against standard method is misleading

, and .
Lancet, 346 (8982): 1085-1087 (October 1995)
DOI: 10.5555/uri:pii:S0140673695917489

Abstract

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.

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