Heading
Test Reliability
Tree Number (repeatable)
Annotation
Scope Note
Test reliability concerns the accuracy of the measuring instrument (scale, questionnaire). One aspect of this is measurement error, and there is a large literature on the theory of measurement error within the wider literature on classical test theory. A second definition of “reliability” is stability over time.
(2-i) Test-retest reliability is one of the properties of a test (scale, instrument, questionnaire) which must be demonstrated by the scale developers, so usually forms part of the psychometric testing of a new scale. This aspect of reliability concerns whether the instrument/scale/questionnaire will give the same measurement on different occasions.
(Nunnally, J.C. & Bernstein, I.H. (1994) Psychometric Theory. Third edition. McGraw-Hill, Inc.
Streiner, D.L. & Norman, G.R. (1995) Health measurement scales: a practical guide to their development and use. Second Edition. Oxford Medical Publications. )
See Also (repeatable)
Inter-Rater Reliability
Entry Term (repeatable)
Allowable Qualifiers
Previous Indexing (repeatable)
History Note