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Detection of drift effects before calculating the standard deviation as a measure of analytical imprecision
Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
|August 1, 1983
Abstract:
The sample standard deviation is commonly used as a measure of analytical imprecision, calculated from a series of n data obtained from one sample split for n assays. Drift effects cause an overestimation and consequently a misinterpretation of the standard deviation in clinical chemistry. The r-ratio test is recommended as a simple procedure for detecting drift effects. It has been found necessary to eliminate outliers before drift effects can be recognized.