DIN 38402-42:1984-05

1 Field of application
2 Scope
3 Parameters
   3.1 Symbols and concepts
   3.2 Computational formulae
        3.2.1 Conventional true value
        3.2.2 Measured value
        3.2.3 Laboratory mean
        3.2.4 Laboratory standard deviation
        3.2.5 Number of individual values
        3.2.6 Overall mean
        3.2.7 Reproducibility standard deviation
        3.2.8 Reproducibility coefficient of
               variation
        3.2.9 Accuracy of recovery
        3.2.10 Repeatability standard deviation
        3.2.11 Repeatability coefficient of variation
        3.2.12 Proportion of outliers
4 Evaluation
  4.1 General
  4.2 Principle used for rejecting outliers
        4.2.1 Type 1 outliers
        4.2.2 Type 2 outliers
        4.2.3 Type 3 outliers
        4.2.4 Type 3 outliers
  4.3 Diagram showing stages of evaluation procedure
        4.3.1 Rejection of outliers
               4.3.1.1 Evaluation Stage 1: calculation of
                       provisional within-laboratory
                       parameters
               4.3.1.2 Evaluation Stage 2: provisional
                       rejection of Type 1 outliers
               4.3.1.3 Evaluation Stage 3: renewed
                       calculation of laboratory parameters
                       without Type 1 outliers
               4.3.1.4 Evaluation Stage 4: calculation of
                       parameters of the laboratory means
                       after rejection of outliners
               4.3.1.5 Evaluation Stage 5: rejection of
                       Type 2 outliers
               4.3.1.6 Evaluation Stage 6: calculation of
                       provisional inter-laboratory test
                       parameters
               4.3.1.7 Evaluation Stage 7: rejection of
                       Type 3 outliers
               4.3.1.8 Evaluation Stage 8: determination of
                       lowest and highest laboratory means
               4.3.1.9 Evaluation Stage 9: restoration of
                       provisional Type 1 outliers
        4.3.2 Results of inter-laboratory test
               4.3.2.1 Evaluation Stage 10: calculation of
                       final parameters
                       4.3.2.1.1 Laboratory parameters
                       4.3.2.1.2 Parameters for the inter-
                                 laboratory test
                                 4.3.2.1.2.1 Total number of
                                             analytical values
                                 4.3.2.1.2.2 Number of
                                             remaining
                                             laboratories
                                 4.3.2.1.2.3 Overall mean
                                 4.3.2.1.2.4 Reproducibility
                                             standard deviation
                                 4.3.2.1.2.5 Reproducibility
                                             coefficient of
                                             variation
                                 4.3.2.1.2.6 Proportion of
                                             outliers
                                 4.3.2.1.2.7 Repeatability
                                             standard
                                             deviation
                                 4.3.2.1.2.8 Repeatability
                                             coefficient of
                                             variation
                                 4.3.2.1.2.9 Evaluation Stage
                                             11: accuracy of
                                             recovery
                                 4.3.2.1.2.10 Evaluation Stage
                                              12: systematic
                                              errors
               4.3.2.2 Evaluation Stage 13: evaluation of
                        further levels
               4.3.2.3 Evaluation Stage 14: summary report
               4.3.2.4 Presentation of final parameters