In survey analysis, e.g. in psychometrics , reliability is a measure of reproducibility of the survey instrument or test. In other words, reliability is a measure of precision - i.e. it describes the random error of the survey instrument.

There are several types of reliability: test-retest reliability , alternate-form reliability , internal consistency reliability , Internal consistency reliability . intraobserver reliability , interobserver reliability .

Note: the term reliability has a different meaning in natural sciences and engineering (see reliability ).

See also: split-halves method , and short online courses:

Survey Analysis ,

Survey Design and Sampling Procedures