ERIC Number: ED243930
Record Type: RIE
Publication Date: 1984-Apr
Reference Count: 0
The Effect of the Position of an Item within a Test on the Item Difficulty Value.
Rubin, Lois S.; Mott, David E. W.
An investigation of the effect on the difficulty value of an item due to position placement within a test was made. Using a 60-item operational test comprised of 5 subtests, 60 items were placed as experimental items on a number of spiralled test forms in three different positions (first, middle, last) within the subtest composed of like items. Item data used resulted from Rasch one-parameter item response calibrations. Variations among the mean Rasch difficulties lay well within one standard deviation. Except for a few outliers, the item difficulty values graph within the 95 percent confidence limits for evaluating overall stability of the estimates. Thus, the consistency of these estimates support the notion that Rasch item parameters are not importantly affected by the position of an item. (Author)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Item Parameters; Item Position (Tests); Rasch Model; Virginia
Note: Paper presented at the Annual Meeting of the American Educational Research Association (68th, New Orleans, LA, April 23-27, 1984).