Explanatory Item Response Models for Polytomous Item Responses

Yıl 2019, Cilt: 6 Sayı: 2, 259 - 278, 15.07.2019

Luke Stanke Okan Bulut

https://doi.org/10.21449/ijate.515085

Cited By: 10

Öz

Item response theory is a widely used framework for the design, scoring, and scaling of measurement instruments. Item response models are typically used for dichotomously scored questions that have only two score points (e.g., multiple-choice items). However, given the increasing use of instruments that include questions with multiple response categories, such as surveys, questionnaires, and psychological scales, polytomous item response models are becoming more utilized in education and psychology. This study aims to demonstrate the application of explanatory item response models to polytomous item responses in order to explain common variability in item clusters, person groups, and interactions between item clusters and person groups. Explanatory forms of several polytomous item response models – such as Partial Credit Model and Rating Scale Model – are demonstrated and the estimation procedures of these models are explained. Findings of this study suggest that explanatory item response models can be more robust and parsimonious than traditional item response models for polytomous data where items and persons share common characteristics. Explanatory polytomous item response models can provide more information about response patterns in item responses by estimating fewer item parameters.

Anahtar Kelimeler

Polytomous IRT, Explanatory item response modeling, Assessment, Partial Credit Model

Explanatory Item Response Models for Polytomous Item Responses

Öz

Item response theory is a widely used framework for the
design, scoring, and scaling of measurement instruments. Item response models
are typically used for dichotomously scored questions that have only two score
points (e.g., multiple-choice items). However, given the increasing use of
instruments that include questions with multiple response categories, such as
surveys, questionnaires, and psychological scales, polytomous item response
models are becoming more utilized in education and psychology. This study aims
to demonstrate the application of explanatory item response models to polytomous
item responses in order to explain common variability in item clusters, person
groups, and interactions between item clusters and person groups. Explanatory
forms of several polytomous item response models – such as Partial Credit Model
and Rating Scale Model – are demonstrated and the estimation procedures of
these models are explained. Findings of this study suggest that explanatory
item response models can be more robust and parsimonious than traditional item
response models for polytomous data where items and persons share common characteristics.
Explanatory polytomous item response models can provide more information about
response patterns in item responses by estimating fewer item parameters.

Anahtar Kelimeler

Polytomous IRT, explanatory item response modeling, assessment, partial credit model

Kaynakça

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