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UOP999-04
Precision Statements in UOP Methods
17 стр.
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Разработчик:
Зарубежные/UOP
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This method is for developing precision statements as reportedin UOP methods and relative bias of the same method betweendifferent laboratories. The calculation of precision, in terms ofrepeatability and intermediate precision (within a laboratory),reproducibility (between laboratories) and relative bias (betweenlaboratories) is described. Precision statements in methods havinga 98 or later suffix were developed by the procedure described;methods having an 88 through 97 suffix used UOP 888-88, whilemethods with suffixes earlier than 88 used UOP 666-82.

The features of UOP 999 are as follows:

Minimum of 16 analyses required with multiple concentrationlevels emphasis. Better identification of the components ofvariation and repeatability estimates. Alignment with ASTMrepeatability, intermediate precision, and reproducibilitydefinitions. Relative bias between laboratories with 95% confidenceinterval.

UOP 999 is the minimum guideline for estimating the initialprecision for new or revised methods. Once a new or revised methodis in use, a reference sample, if available, should be run on aregular basis. When 16 analyses have been completed, individual andrange control charts are to be used to estimate the long-term UOPrepeatability and are to be maintained on an ongoing basis. Theexample calculations in UOP 999 are made using Minitaba, astatistical software package. The details of the calculations arein UOP 999-97 Supplement.