ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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Precision

The relative degree of repeatability, i.e. how closely the values within a series of replicate measurements agree. It is the result of resolution and stability.

Publication Source: FDA Glossary of Computerized System and Software Development Technology

See also: Accuracy Bias Calibration

Precision

(ICH Q2 (R1)) The precision of an analytical procedure expresses the closeness of agreement (degree of scatter) between a series of measurements obtained from multiple sampling of the same homogeneous sample under the prescribed conditions. Precision may be considered at three levels: repeatability, intermediate precision and reproducibility.

Precision should be investigated using homogeneous, authentic samples. However, if it is not possible to obtain a homogeneous sample it may be investigated using artificially prepared samples or a sample solution.

The precision of an analytical procedure is usually expressed as the variance, standard deviation or coefficient of variation of a series of measurements.

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