Canadian Medical Guide > Analytical, Diagnostic and Therapeutic Techniques and Equipment > Diagnosis > Diagnostic Errors > Observer Variation Terms and Definitions

Observer Variation

Medical Definition:	The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
Guide Notes:	IM GEN only; coord NIM with disease /epidemiol (IM) or specific non-disease term /statist (IM); no qualif; specify geog if pertinent
Also Called:	Interobserver Variation,Intraobserver Variation

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