The Dif Identification in Constructed Response Items Using Partial Credit Model

Year 2018, Volume: 5 Issue: 1, 73 - 89, 01.01.2018

Heri Retnawati

https://doi.org/10.21449/ijate.347956

Cited By: 1

Abstract

The study was to identify the load, the type and
the significance of differential item functioning (DIF) in constructed response
item using the partial credit model (PCM). The data in the study were the
students’ instruments and the students’ responses toward the PISA-like test
items that had been completed by 386 ninth grade students and 460 tenth grade
students who had been about 15 years old in the Province of Yogyakarta Special
Region in Indonesia. The analysis toward the item characteristics through the
student categorization based on their class was conducted toward the PCM using
CONQUEST software. Furthermore, by applying these items characteristics, the
researcher draw the category response function (CRF) graphic in order to
identify whether the type of DIF content had been in uniform or non-uniform.
The significance of DIF was identified by comparing the discrepancy between the
difficulty level parameter and the error in the CONQUEST output results. The
results of the analysis showed that from 18 items that had been analyzed there
were 4 items which had not been identified load DIF, there were 5 items that
had been identified containing DIF but not statistically significant and there
were 9 items that had been identified containing DIF significantly. The causes
of items containing DIF were discussed.

Keywords

DIF, polytomous data, partial credit model

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