An Upper Asymptote for the Three-Parameter Logistic Item-Response Model
- Author(s):
- Barton, Mark A.; Lord, Frederic M.
- Publication Year:
- 1981
- Report Number:
- RR-81-20
- Source:
- ETS Research Report
- Document Type:
- Report
- Page Count:
- 24
- Subject/Key Words:
- Office of Naval Research, Item Response Theory, Mathematical Models, Statistical Analysis
Abstract
An upper-asymptote parameter was added to the three-parameter logistic item response model. This four-parameter model was compared to the three-parameter model on four data sets. The fourth parameter increased the likelihood in only two of the four sets. Ability estimates for the students were generally unchanged by the introduction of the fourth parameter. (Author).
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- http://dx.doi.org/10.1002/j.2333-8504.1981.tb01255.x