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

Provides basic methods for estimating the bias of a measurement method and the laboratory bias when a measurement method is applied. In order that the measurements are made in the same way, it is important that the measurement method has been standardized. Can be applied only if the accepted reference value can be established as a conventional true value, e.g. by measurement standards or suitable reference materials or by referring to a reference measurement method or by preparation of a known sample.