Test-retest reliability
Test-retest reliability is a measure in Psychometrics and Statistics used to assess the consistency of a Research instrument over time. It is one of the various types of reliability used in scientific research.
Pronunciation
- Test-retest reliability: /ˈtɛst riːˈtɛst rɪˌlaɪəˈbɪlɪti/
Etymology
The term "Test-retest reliability" is derived from the English words "test", "retest", and "reliability". The term "test" comes from the Old French tester meaning "to bear witness", "retest" is a compound of "re-" and "test" indicating a repetition of the test, and "reliability" comes from the Latin reliabilis meaning "trustworthy".
Definition
Test-retest reliability refers to the degree to which test scores are consistent from one test administration to the next. Measurements are gathered from a single rater who uses the same methods or instruments and the same testing conditions. This includes short-term and long-term retesting.
Related Terms
- Reliability: The overall consistency of a measure. A measure is said to have high reliability if it produces similar results under consistent conditions.
- Validity: The extent to which a concept, conclusion or measurement is well-founded and corresponds accurately to the real world.
- Inter-rater reliability: The degree of agreement among raters or judges. If everyone agrees, the inter-rater reliability is 1 (or 100%).
- Intra-rater reliability: The degree of agreement among repeated administrations of a diagnostic test performed by a single rater.
- Cronbach's alpha: A measure of internal consistency, that is, how closely related a set of items are as a group.
See Also
External links
- Medical encyclopedia article on Test-retest reliability
- Wikipedia's article - Test-retest reliability
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