Test reliability is the consistency of scores obtained by the same persons when retested with the identical test or with an equivalent from of the test (Anastasi & Urbina, 2005).
The concept of reliability underlies the computation of the error of measurement of a single score, whereby we can predict the range of fluctuation likely to occur in a single individual’s score as a result of irrelevant or unknown chance factors.
It has been used to cover several aspects of score consistency.
Test reliability indicates the extent to which individual differences in test score are attributable to true differences in the characteristics under consideration and the extent to which they are attribute to chance errors.
Measure of test reliability make it possible to estimate what proportion of the total variances of test score is error variance.
Since all types of reliability are concerned with the degree of consistency or agreement between two independently derived sets of scores, they can all be expressed in terms of a correlation coefficient.
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