ERIC Number: ED235197
Record Type: RIE
Publication Date: 1983-Apr
Reference Count: 0
An Investigation of the Feasibility of Using Item Response Theory in the Pre-Equating of Aptitude Tests.
Eignor, Daniel R.; Cook, Linda L.
The purpose of this study was to determine the extent to which item parameters estimated on pretest data from the verbal section of the Scholastic Aptitude Test (SAT) can be used for equating purposes in a situation where intact final form SAT testing data have normally been used. Items appearing in two final SAT-verbal forms were calibrated almost completely from pretest data. An elaborate linkage system was devised and utilized to get parameter estimates for the items, contained in multiple pretests, on the same scale. The final forms under study were equated to two different old forms; the equatings were then redone using item parameter estimates based on the pretest data. For each form, the item response theory (IRT) equating based on pretest statistics was then compared to the IRT equating based on intact final form data and the linear equating used operationally. The results varied considerably across forms, ranging from acceptable to marginally acceptable. The overall results of the pre-equating were deemed sufficiently promising that an investigation of pre-equating two forms of SAT-mathematical will be undertaken. (BW)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: College Entrance Examination Board, New York, NY.
Identifiers: Pre Equating (Tests); Scholastic Aptitude Test
Note: Paper presented at the Annual Meeting of the American Educational Research Association (67th, Montreal, Quebec, April 11-15, 1983). Small print in some figures.