Taking the determination method of chloride content in soap as an example to introduce the statistical analysis method of precision test according to GB/T 6379.2-2004.The consistency and outlier value of the test data of the 8 laboratories participating in the precision test were checked by Mandel,Cochrane and Grubbs test.The precision of the method was expressed in terms of repeatability limit and reproducibility limit,and the expression of the repeatability limit r and reproducibility limit R under different conditions were classified and introduced.
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