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DOI: 10.1177/0146621606291569 Standardized Conditional SEM: A Case for Conditional ReliabilityIllinois Institute of Technology
Texas State UniversitySan Marcos , lprice{at}txstate.edu
Georgia State University
Measured Progress An examinee-level (or conditional) reliability is proposed for use in both classical test theory (CTT) and item response theory (IRT). The well-known group-level reliability is shown to be the average of conditional reliabilities of examinees in a group or a population. This relationship is similar to the known relationship between the square of the conditional standard error of measurement (SEM) and the square of the group-level SEM. The proposed conditional reliability is illustrated with an empirical data set in the CTT and IRT frameworks.
Key Words: Index terms: conditional standard error of measurement conditional reliability classical test theory item response theory
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