observer variation

observer variation,

n the failure by the observer to measure or identify a phenomenon accurately, which results in an error. The observer may miss an abnormality or use faulty techniques, such as incorrect measurement or misinterpretation of the data. Two types are interobserver variation (the amount observers vary from one another when reporting on the same material) and intraobserver variation (the amount one observer varies between observations when reporting more than once on the same material).
References in periodicals archive ?
Observer variation in the diagnosis of dysplasia in Barrett's esophagus.
Assessment of bone density from plain x-rays is not appropriate as there is a observer variation.
Observer variation in grading sacroiliac radiographs might be a cause of 'sacroiliitis' reported in certain disease states.
Observer variation in morphometry has been reported previously, and similar variations can occur, even with mechanical approaches to cytometry.