Trueness, Precision and Accuracy

Trueness (distortion)
Trueness describes the level of consistency between the mean value of a series of measurements and the reference value. If the mean value of the measurement series agrees well with the reference value, the trueness is high. For trueness measurements with both quantitative and qualitative tests, Biomex uses certified reference material or a certified reference method.

Precision
Precision is defined as the level of agreement between individual, independent measurement results in a measurement series. It characterizes the scattering of the measurement results around the mean value and can be represented by the (relative) standard deviation. The measurement method is precise when the individual measurement results are close together.

With precision, a distinction is made on the one hand between repeatability, which refers to measurements of the same parameter under constant measurement conditions  (e.g. the same test specimen, the same tester, the same measuring equipment, the same place or time), and on the other reproducibility, which refers to measurements of the same parameter under changed measurement conditions (e.g. several devices of the same type, different testers, different place or time).

Accuracy (derived from trueness and precision)
The accuracy is a measure of the agreement between the (individual) measurement result and the reference value. A high level of accuracy is fulfilled when both the precision and the trueness are high.

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