U.S. National Library of Medicine
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).
The numerical value of observer variation in Chaldean Numerology is: 6
The numerical value of observer variation in Pythagorean Numerology is: 6
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"observer variation." Definitions.net. STANDS4 LLC, 2017. Web. 18 Dec. 2017. <http://www.definitions.net/definition/observer variation>.