1 Scope
1.1 The purpose of GB/T 6379 is as follows:
a) to outline the general principles to be understood when assessing accuracy (trueness and precision) of measurement methods and results, and in applications, and to establish practical estimations of the various measures by experiment (GB/T 6379.1);
b) to provide a basic method for estimating the two extreme measures of the precision of measurement methods by experiment (GB/T 6379.2);
c) to provide a procedure for obtaining intermediate measures of precision, giving the circumstances in which they apply and methods for estimating them (ISO 5725-3);
d) to provide basic methods for the determination of the trueness of a measurement method (ISO 5725-4);
e) to provide some alternatives to the basic methods, given in GB/T 6379.2 and ISO 5725-4, for determining the precision and trueness of measurement methods for se under certain circumstances (ISO 5725-5);
f) to present some practical applications of these measures of trueness and precision.
1.2 This Part of GB/T 6379 is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the test result, although this single value may be the outcome of a calculation from a set of observations.
This Part of GB/T 6379 defines values which describe, in quantitative terms, the ability of a measurement method to give a correct result (trueness) or to replicate a given result (precision). Thus there is an implication that exactly the same thing is being measured, in exactly the same way, and that the measurement process is under control.
This Part of GB/T 6379 may be applied to a very wide range of materials, including liquids, powders and solid objects, manufactured or naturally occurring, provided that due consideration is given to any heterogeneity of the material.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 6379. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 3358.1-1993 Terms for Statistics — Part 1: Terms for General Statistics
GB/T 3358.2-1993 Terms for Statistics — Part 2: Terms for Statistical Quality Control
GB/T 3358.3-1993 Terms for Statistics — Part 3: Terms for Experimental Design
GB/T 6379.2-2004 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method
ISO 3534-1:1993 Statistics — Vocabulary and Symbols — Part 1: Probability and General Statistical Terms
ISO 5725-3: 1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 3: Intermediate Measures of the Precision of a Standard Measurement Method
ISO 5725-4: 1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 4: Basic Methods for the Determination of the Trueness of a Standard Measurement Method
3 Definitions
For the purposes of this Part of GB/T 6379, the following definitions apply. Some definitions are taken from ISO 3534-l.
The symbols used in GB/T 6379 are given in Appendix A.
