Repeatability

Repeatability is a technical term from the field of metrology and especially analytical chemistry, and describes the precision under repeatability conditions.

The repeatability of the extent of agreement between the results of independent measurements of the same analyte, which were carried out under the following conditions:

• The same measurement procedure
• Same operator
• The same instrument
• The same place
• The same experimental conditions
• Repeating the measurements within short time intervals

Repeatability are generally present when a sample is repeated several times in quick succession examined with the same equipment. In contrast to the reproducibility, the boundary conditions are much more sharply defined.

Repeatability is a characteristic of the process, not the result. It is calculated by multiplying the standard deviation of the individual results by a factor tabulated. For a confidence level of 95% of the factor is 2.8. Ideally, at least eight individual measurements should be performed.

See also: Comparison of precision, laboratory precision, measurement system analysis