ERIC Number: ED099417
Record Type: RIE
Publication Date: 1974-Aug
Reference Count: 0
Removing the Effects of Random Guessing from Latent Trait Ability Estimates. Research Bulletin No. 74-32.
Waller, Michael I.
In latent trait models the standard procedure for handling the problem caused by guessing on multiple choice tests is to estimate a parameter which is intended to measure the "guessingness" inherent in an item. Birnbaum's three parameter model, which handles guessing in this manner, ignores individual differences in guessing tendency. This paper presents a model or procedure which uses the information contained in the interaction between a person and an item to remove the effects of random guessing from estimates of ability, difficulty, and discrimination. Simulated and real data are presented which support the model in terms of fit and information. (Author/RC)
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: Educational Testing Service, Princeton, NJ.
Note: Paper presented at the Annual Meeting of the American Educational Research Association (Chicago, Illinois, April 1974)