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Further Study of the Choice of Anchor Tests in Equating
Author(s) -
Trierweiler Tammy J.,
Lewis Charles,
Smith Robert L.
Publication year - 2016
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/jedm.12128
Subject(s) - equating , test (biology) , correlation , statistics , context (archaeology) , reliability (semiconductor) , test score , mathematics , psychology , standardized test , paleontology , power (physics) , physics , geometry , quantum mechanics , rasch model , biology
In this study, we describe what factors influence the observed score correlation between an (external) anchor test and a total test. We show that the anchor to full‐test observed score correlation is based on two components: the true score correlation between the anchor and total test, and the reliability of the anchor test. Findings using an analytical approach suggest that making an anchor test a miditest does not generally maximize the anchor to total test correlation. Results are discussed in the context of what conditions maximize the correlations between the anchor and total test.