reliability is the ability of a person or system to perform and maintain its functions in routine circumstances, as well as hostile or unexpected circumstances. In statistics, reliability is directly related to the accordance of a number of measurements.
There are four types of reliability: namely inter-rater or inter-observer reliability test-retest reliability parallel-forms reliability internal consistency reliability.
Inter-Rater or Inter-Observer Reliability
Inter-rater or inter-observer reliability is the evaluation of degrees which observers gives consistently to the same phenomenon.
Test-Retest Reliability
It means the measurement of a consistency from time to time.
Parallel-Forms Reliability
Evaluation of the consistency of the results of two tests held in the same way.
Internal Consistency Reliability
Evaluation of the consistency of results across items within a test.
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