repetabilitii

Repetabilitatea, commonly translated as repeatability, is a statistical measure of the precision of a measurement system when a single operator uses the same instrument to measure the same characteristic on identical items under unchanged conditions and in a short time. It describes how closely successive measurements agree when the setup is held constant. Repeatability is distinct from reproducibility, which concerns variation when conditions such as the operator, instrument, environment, or location change between measurements.

Assessment is typically part of measurement system analysis (MSA) used in manufacturing and laboratory settings. In a standard gauge repeatability and reproducibility (Gage R&R) study, repeatability is estimated from the variation of repeated measurements on the same part by the same operator with the same instrument. The relevant statistic is the standard deviation (or variance) of these repeated readings; sometimes the within-part, within-run component of ANOVA is used to separate sources of variability.

Interpretation: lower repeatability variance indicates higher precision of the measurement system under those conditions. High repeatability can result from instrument noise, operator inconsistency, or unstable artifacts. Improvements include regular instrument calibration, clearer measurement procedures, environmental control, and operator training.

Limitations: repeatability does not capture variation due to different operators, instruments, or environments; it is a short-term, in-lab metric and should be interpreted alongside reproducibility for a complete view of measurement system performance. In measurement science, the standard term is repeatability; in Romanian technical language the equivalent is repetabilitate. The form repetabilitii may appear as a misspelling.