ISO 5725-1:1994 pdf download.Accuracy (trueness and precision) of measurement methods and results
1 Scope
1.1 The purpose of ISO 5725 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
(ISO 5725-1);
b) to provide a basic method for estimating the two extreme measures ot the precision of measurement methods by experiment (ISO 5725-2);
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 ISO 5725-2 and ISO 5725-4, for determining the precision and trueness of measurement methods for use under certain circumstances (ISO 5725-5);
f) to present some practical applications of those measures of trueness and precision (ISO 5725-6).
1.2 This part of ISO 5725 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.
It defines values which describe, in quantitative terms, the ability of a measurement method to give a correct resuIt (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 ISO b/25 may he 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 standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 5725. At the time of publication, the editions indicated were valid. All standaids are subject to revision, and parties to agreements based on this part of ISO 5725 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of I[C and ISO maintain registers of currently valid International Standards.
ISO 3534-1:1993, Statistics - Vocabulary and sym-bols一Part 1: Probability and general statistical terms.
ISO 5725-2:1994，Accuracy (trueness and precision) of measurement methods and results一Part 2: Basic method for the determination of repeatability and re-producibility of a standard measurement method.
ISO 5725-3:1994，Accuracy (trueness and precision) of measurement methods and results 一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一Part 4: Basic methods for the determination of the trueness of a standard measurement method.ISO 5725-1 pdf download.