A major advantage of the Kuder-Richardson reliability coefficient (such as KR-20) is that it requires only a single test administration, since it is based on internal consistency of test items. This makes it more practical than methods that require multiple administrations.
[Reference: Helwig, A. A. (2020). CPCE Study Guide and Review; Cohen, R. J., & Swerdlik, M. E. (2018). Psychological Testing and Assessment., ]
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