ERIC Number: ED457194
Record Type: RIE
Publication Date: 2000-Apr
Using Out-of-Scale Information To Increase the Precision of Test Scores.
Capar, Nilufer K.; Thompson, Tony; Davey, Tim
Information provided for computerized adaptive test (CAT) simulees was compared under two conditions on two moderately correlated trait composites, mathematics and reading comprehension. The first condition used information provided by in-scale items alone, while the second condition used information provided by in- and out-of-scale items together in computing the total information provided for simulees at their true ability levels. Information gains and associated bias and standard error measures were reported. Overall, information provided for simulees was higher for the second condition. Information provided increased approximately 17% for simulees on the reading comprehension and mathematics CATs when items were allowed to contribute information to both CATs (with their out-of-scale parameters). Results show that out-of-scale information can be used to improve a given measurement procedure without increasing the test length and testing time. For this reason, it merits further exploration. (Contains 6 figures, 2 tables, and 26 references.) (Author/SLD)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A
Note: Paper presented at the Annual Meeting of the National Council on Measurement in Education (New Orleans, LA, April 25-27, 2000).