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- Title
Comparing methods of measurement: why plotting difference against standard method is misleading.
- Authors
Bland, J M; Altman, D G
- 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.
- Publication
Lancet (London, England), 1995, Vol 346, Issue 8982, p1085
- ISSN
0140-6736
- Publication type
Journal Article
- DOI
10.1016/s0140-6736(95)91748-9