Standards Development

Scope

This document describes a procedure that lays out the statistical study design and methodology to assess the degree of systemic disagreement (relative bias) between two test methods. It also lays down how to, if necessary, develop a functional relationship to correct for the relative bias, thus permitting use of one method as a predictor of the other after applying the bias correction.

Purpose

In the current market place, a (global) multitude of standard test methods are available which all claim to measure the same property. This situation has led to multiple options for the choice of test method(s) to be specified in product specifications for commerce (or even for regional or national specification setting). Statistical techniques are available to assess and develop mathematical functions that correct for systemic biases between methods that claim to measure the same property (for example, ASTM D6708 or ISO 16269). Given the mandate and topics covered by ISO 4259, it is proposed to add to the existing series a new part 5.

The aforementioned procedure will be provided in a manner that can be followed by technical professionals with appropriate proficiency in mathematics.