AOAC GFA Stakeholder Program Meeting Book (August 27, 2023)

Current Definition

VIM4 Second Committee Draft Definition measurement bias bias estimate of a systematic error NOTE 1 Measurement bias differs from bias in mathematical statistics. Measurement bias should be accompanied with a stated uncertainty which can be negligible for some purposes. NOTE 2 Sometimes measurement bias is incorporated in a measurement model as a correction intermediate measurement precision intermediate precision measurement precision under intermediate precision conditions NOTE 1 Intermediate precision may be evaluated by replicate measurements on similar objects, provided variability among the objects is negligible. for an estimated systematic error.

3.2 Bias: Difference between the expectation of the test results and an accepted reference value. Bias is the total systematic error as contrasted to random error. There may be one or more systematic error components contributing to the bias.

3.14 Intermediate precision: Precision under intermediate conditions (ISO 3534-2).