Appropriateness measurement in nonparametric item
response theory modeling is affected by the reliability of
the items, the test length, the type of aberrant response
behavior, and the percentage of aberrant persons in the
group. The percentage of simulees defined a priori as
aberrant responders that were detected increased when
the mean item reliability, the test length, and the ratio of
aberrant to nonaberrant simulees in the group increased.
Also, simulees "cheating" on the most difficult items
in a test were more easily detected than those "guessing"
on all items. Results were less stable across replications
as item reliability or test length decreased.
Results suggest that relatively short tests of at least 17
items can be used for person-fit analysis if the items
are sufficiently reliable. Index terms: aberrance detection,
appropriateness measurement, nonparametric
item response theory, person-fit, person-fit statistic U3.
Meijer, Rob R.; Molenaar, lvo W.; Sijtsma, Klaas.
Influence of Test and Person Characteristics on Nonparametric Appropriateness Measurement.
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