ERIC Number: ED213753
Record Type: RIE
Publication Date: 1982-Mar
Reference Count: 0
Obtaining Some Degree of Correspondence Between Unequatable Scores: A Comparison of Item Response Theory and Equipercentile Equating Methods.
Yen, Wendy M.
Test scores that are not perfectly reliable cannot be strictly equated unless they are strictly parallel. This fact implies that tau equivalence can be lost if an equipercentile equating is applied to observed scores that are not strictly parallel. Thirty-six simulated data sets are produced to simulate equating tests with different difficulties and discriminations. The data are generated to produce tau-equivalent item response theory results. When an equipercentile equating is applied to these data, locally biased (that is, non-tau equivalent) results are produced for tests of unequal difficulty. (Author/GK)
Publication Type: Speeches/Meeting Papers; Reports - Evaluative
Education Level: N/A
Authoring Institution: N/A
Identifiers: Data Sets; Equipercentile Equating; Tau Equivalence
Note: Paper presented at the Annual Meeting of the American Educational Research Association (66th, New York, NY, March 19-23, 1982).