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[The continuous graphic presentation of interdepartmental results (author's transl)]
Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
|October 1, 1976
Abstract:
The results of interdepartmental determinations can be clearly presented in the laboratory in two ways: 1. Entry on a test card, according to Shewhart, as used in internal quality control. 2. Entry on a test card, constructed on the principle of the Cusum test. By the latter procedure, systematic errors are detected sooner than with the usual test card. A graphic variant of the Cusum test is described; a V-mask is not required; the card superficially resembles the usual control card, and the calculation time is minimal. This method may also be used to advantage in internal quality control.