Item Response Model Approaches to Evaluating the Item Format Effects

• In Event: Poster Session 1
  In Poster Session: Rasch Measurement Research Posters

Abstract

The purpose of this study is twofold. First, the current study introduced ways to investigate the item format effect using the item response model. Second, the study examined how the format of items in the PISA 2006 science assessment contributes to item difficulty. In order to tease out the effect of item format and test whether any relationship between item format and difficulty exists, two item response models (IRM) were used. For the models, the current study applied the LLTM and the LLTM-R models to the PISA 2006 data and compared the results across models. With this comparison, we expect to deepen our understanding on the relationship among item format and difficulty.

Authors

• In-Yong Park, Yonsei University

• Yongsang Lee, Korea Institute for Curriculum and Evaluation

• Hwang gyu Lim, Korea Institute for Curriculum and Evaluation