Proposed method examines changes in scale reliability during revision, highlighting its utility in scale development.
A test for change in composite reliability as a result of scale revision or modification is proposed. The approach can be used either in a one-tailed manner to test for increase (or decrease) in reliability or in a two-tailed fashion to test for a difference in the composite reliability coefficients as a consequence of dropping or adding one or more components. The procedure is useful for purposes of examining whether a revision changes the population reliability of a scale undergoing development. The method can also be utilized for addressing questions about shortening of long scales. The outlined approach is illustrated with a pair of examples.
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Raykov et al. (2003) studied this question.
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