Effects of local item dependence on the fit and equating performance of the three-parameter logistic model
1984
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Effects of local item dependence on the fit and equating performance of the three-parameter logistic model
Authors
Published Date
1984
Publisher
Type
Article
Abstract
Unidimensional item response theory (IRT) has become
widely used in the analysis and equating of educational
achievement tests. If an IRT model is true,
item responses must be locally independent when the
trait is held constant. This paper presents several measures
of local dependence that are used in conjunction
with the three-parameter logistic model in the analysis
of unidimensional and two-dimensional simulated data
and in the analysis of three mathematics achievement
tests at Grades 3 and 6. The measures of local dependence
(called Q₂ and Q₃) were useful for identifying
subsets of items that were influenced by the same factors
(simulated data) or that had similar content (real
data). Item pairs with high Q₂ or Q₃ values tended to
have similar item parameters, but most items with
similar item parameters did not have high Q₂ or Q₃
values. Sets of locally dependent items tended to be
difficult and discriminating if the items involved an
accumulation of the skills involved in the easier items
in the rest of the test. Locally dependent items that
were independent of the other items in the test did not
have unusually high or low difficulties or discriminations.
Substantial unsystematic errors of equating were
found from the equating of tests involving collections
of different dimensions, but substantial systematic errors
of equating were only found when the two tests
measured quite different dimensions that were presumably taught sequentially.
Keywords
Description
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Yen, Wendy M. (1984). Effects of local item dependence on the fit and equating performance of the three-parameter logistic model. Applied Psychological Measurement, 8, 125-145. doi:10.1177/014662168400800201
Suggested citation
Yen, Wendy M.. (1984). Effects of local item dependence on the fit and equating performance of the three-parameter logistic model. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/107543.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.