Repeatability vs. Reproducibility — What's the Difference?

Repeatability or test–retest reliability is the closeness of the agreement between the results of successive measurements of the same measure, when carried out under the same conditions of measurement. In other words, the measurements are taken by a single person or instrument on the same item, under the same conditions, and in a short period of time.

Reproducibility is a major principle underpinning the scientific method. For the findings of a study to be reproducible means that results obtained by an experiment or an observational study or in a statistical analysis of a data set should be achieved again with a high degree of reliability when the study is replicated.

To say again

To produce again or anew; re-create

To utter in duplication of another's utterance

To produce a copy, imitation, or representation of

To recite from memory

To generate (offspring) by sexual or asexual means.

To tell to another

To bring (an event in one's memory, for example) to mind again; recall.

To do, experience, or produce again

To generate offspring.

To express (oneself) in the same way or words

To undergo copying

To say something again.

The quality of being reproducible.

To do or experience something again, especially to win a championship for a second time in a row.

The closeness of agreement among repeated measurements of a variable made under the same operating conditions over a period of time, or by different people.

To occur or happen again

The closeness of agreement among scientific results more generally, at the level of whole experiments, either nearly identical or similar.

To commit the fraudulent offense of voting more than once in a single election.

The quality of being reproducible

An act of repeating.

Something repeated, as an interval in athletic training.

A broadcast of a television or radio program that has been previously broadcast; a rerun.

A passage or section that is repeated.

A sign usually consisting of two vertical dots, indicating a passage to be repeated.

Of, relating to, or being something that repeats or is repeated

The property or quality of being repeatable.

The absence of variation amongst multiple measurements taken under the same conditions.

The degree to which a machine can move its parts to the same position (location) repeatedly, which is closely (and mathematically) related to its precision and accuracy.