Comparison of Person-Fit Statistics for Polytomous Items in Different Test Conditions

Yıl 2019, Cilt: 10 Sayı: 4, 348 - 364, 13.12.2019

Asiye Şengül Avşar

https://doi.org/10.21031/epod.525647

Cited By: 2

Öz

The
validity of individual test scores is an important issue that needs to be
studied in psychological and educational assessment. An important factor
affecting the validity of individual test scores is aberrant item response
behavior. Aberrant item scores may increase/decrease the individuals’ scores
and as a result individuals’ ability can be estimated above/below their true
ability. Person-fit statistics (PFS) are useful tools to detect aberrant
behavior. There are a great number of parametric and nonparametric PFS in the
literature. The general purpose of the study is to examine the effectiveness of
the parametric and nonparametric PFS in data sets which consist of polytomous
items. This study is fundamental research aimed at determining the effectiveness
of PFS using simulated data sets. According to the results, as expected, as the
Type I error rates (significance alpha level) increased, detection rates
(power) increased. In general, it is seen that as the number of misfitting item
score vector and number of items increased, detection rates increased.
Generally, nonparametric PFS (N-PFS) (especially G^P) detected
more aberrant individuals than parametric PFS (P-PFS) l_z^p.
However, in some tests’ conditions l_z^p detected
more aberrant individuals than N-PFS for longer tests. The results indicate
that N-PFS outperformed P-PFS in most of the test conditions.

Anahtar Kelimeler

polytomous items, aberrant item response, person-fit statistics

Kaynakça

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