BS ISO 5725-6:1994

Foreword
Introduction
1. Scope
2. Normative references
3. Definitions
4. Determination of limits
     4.1 Repeatability and reproducibility limits
     4.2 Comparisons based on more than two values
5. Methods for checking the acceptability of test
     results and determining the final quoted result
     5.1 General
     5.2 Methods for checking the acceptability of test
          results obtained under repeatability conditions
     5.3 Methods for checking the acceptability of test
          results obtained under both repeatability and
          reproducibility conditions
6. Method for checking the stability of test results
     within a laboratory
     6.1 Background
     6.2 Methods for checking stability
7. Use of repeatability and reproducibility standard
     deviations in assessing laboratories
     7.1 Assessment method
     7.2 Evaluation of the use of a measurement method
          by a laboratory not previously assessed
     7.3 Continued assessment of previously approved
          laboratories
8. Comparison of alternative measurement methods
     8.1 Origin of alternative measurement methods
     8.2 Purpose of comparing measurement methods
     8.3 Method B is a candidate for an alternative standard
          method ("Standardization experiment" not defined)
     8.4 Accuracy experiment
     8.5 Method B is a candidate for a routine method
Annex A (normative) Symbols and abbreviations used in
        ISO 5725

Gives indications of the way in which accuracy data can be used in various practical situations. Concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single numerical figure as the result. Coverage includes: repeatability and reproducibility limits; comparison of alternative measurement methods; method for checking the stability of test results within a laboratory. Also gives definitions.

1.1 The purpose of this part of ISO5725 is to give some indications of the way in which accuracy data can be used in various practical situations by: giving a standard method of calculating the repeatability limit, the reproducibility limit and other limits to be used in examining the test results obtained by a standard measurement method;providing a way of checking the acceptability of test results obtained under repeatability or reproducibility conditions;describing how to assess the stability of results within a laboratory over a period of time, and thus providing a method of “quality control” of the operations within that laboratory;describing how to assess whether a given laboratory is able to use a given standard measurement method in a satisfactory way;describing how to compare alternative measurement methods. 1.2 This part of ISO5725 is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single numerical figure as the result, although this single figure may be the outcome of a calculation from a set of observations. 1.3It is assumed that the estimates of trueness and precision for the method have been obtained in accordance with parts1 to 5 of ISO5725. 1.4Any additional information regarding the field of application will be given at the beginning of each particular application.