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ERIC Number: ED439143
Record Type: Non-Journal
Publication Date: 1999-Apr-20
Pages: 66
Abstractor: N/A
Reference Count: N/A
Conditional Standard Errors of Measurement for Tests Composed of Testlets.
Lee, Guemin
Previous studies have indicated that the reliability of test scores composed of testlets is overestimated by conventional item-based reliability estimation methods (S. Sireci, D. Thissen, and H. Wainer, 1991; H. Wainer, 1995; H. Wainer and D. Thissen, 1996; G. Lee and D. Frisbie). In light of these studies, it seems reasonable to ask whether the item-based estimation methods for the conditional standard errors of measurement (SEM) would provide underestimates for tests composed of testlets. The primary purpose of this study was to investigate the appropriateness and implication of incorporating a testlet definition into the estimation procedures of the conditional SEM for tests composed of testlets. Another purpose was to investigate the bias in estimates of the conditional SEM when using item-based methods instead of testlet-based methods. Several estimation procedures were proposed and compared in estimating conditional SEM for tests composed of testlets. Conditions under which these might be used are described. (Contains 4 tables, 23 figures, and 40 references.) (Author/SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A