Item Analysis of Heat Transfer Concept Using Rasch Model in Elementary School

Abstract

This study aims to analyze test items of heat transfer instructional materials using the Rasch model to obtain information on the Wright map, item measure, item fit, and item reliability. This study applied a quantitative-descriptive research design. The subjects in this study were 75 fifth graders of State Elementary School 192 of Pekanbaru. The students were asked to do 11 essay items. Students' responses on the essay items were collected through Google Form. The collected data were then analyzed using the Rasch model on the Winstep® application version 3.73. Based on the data analysis, item 2 and 3 were the most difficult items, and item 10 was the easiest item. All items are at a moderate difficulty level. There was an invalid item of 11 items. The item reliability value was 0.75 which meant sufficient. In conclusion, the 10 test items (1 is invalid) are selected for inclusion in the achievement test to measure the students' understanding of heat transfer instructional materials.