Introduction

ISO 5725 uses two terms, “trueness” and “precision”, to describe the accuracy of a measurement method. “Trueness” refers to the closeness of agreement between the expectation of a measurement result and a true value. "Precision" refers to the closeness of agreement between independent measurement results obtained under stipulated conditions.

Course Objectives

Participants for this training course will learn:

• specifies basic methods for estimating the bias of a measurement method and the laboratory bias when a measurement method is applied

• provides a practical approach of a basic method for routine use in estimating the bias of measurement methods and laboratory bias

• provides a brief guidance to all personnel concerned with designing, performing or analyzing the results of the measurements for estimating bias.

• measurement methods which yield measurements on a continuous scale and give a single value as the measurement result, although the single value can be the outcome of a calculation from a set of observations.

• the measurement method has been standardized and all measurements are carried out according to that measurement method.

Target Audience

• This training is designed for individuals seeking to expand their knowledge of measurement accuracy, including trueness and precision of methods and results.
• It is suitable for professionals aiming to understand and evaluate the reliability and validity of measurement outcomes.
• The course targets those working in testing, calibration, quality control, and laboratory environments.
• It is also relevant for engineers, technicians, and specialists involved in measurement and data analysis.
• The program benefits anyone interested in improving measurement quality, consistency, and performance evaluation.

Course Outlines

Day 1

Introduction

• Scope

• Normative references

• Terms and definitions

• Symbols

Day 2

Determination of the bias of a standard measurement method by an interlaboratory experiment

• Experimental design considerations

• Objective

• Layout of the experiment

• Cross-references to ISO 5725-1 and ISO 5725-2

• The statistical model

• Required number of laboratories and measurements

Day 3

Requirements of the accepted reference value

• Approaches to assigning the accepted reference value

• Materials used in the experiment

• Requirements of measurement uncertainty of the accepted reference value

Carrying out the experiment

• Evaluation of precision

• Check of precision

• Estimation of the bias of the standard measurement method

• Example

Day 4

Determination of the laboratory bias of one laboratory using a standard measurement method

• Experimental design considerations

• Objective

• Layout of the experiment

• Cross-references to ISO 5725-1 and ISO 5725-

• The statistical model

• Number of measurement results

• Requirements of the accepted reference values

Day 5

Carrying out the experiment

• Check of the within-laboratory standard deviation

• Estimation of the laboratory bias

Report to the panel and decisions to be taken by the panel

• Cross-reference to ISO 5725-2

• Report by the statistical expert

• Decisions by the panel