Analysis of problem solving skills in work and energy material using the RASCH model

The purpose of this study was to analyze students’ problem solving skills in work and energy material using the RACH model. The method in this study was a descriptive method using survey techniques. The instrument used is a problem solving test. Tests were given to 253 students from eighth grade in junior high schools in Banjarmasin randomly selected. The RASCH model was used as a processing stage of data from raw data into logit numbers that provided information related to infit, outfit and unidimensionality using a winstep program to achieve this goal. This study investigated the quality of person measure, person reliability, and variable map. The results of the analysis are based on the RASCH model with the Mean Square Statistics (MNSQ) value is 0.95, Z Standard (ZSTD) is 0.0, pearson reliability is 0.77, and cronbach alpha (KR-20) person raw score test reliability is 0.86. Lower logits manifests students with lower ability. This proved that the students’ problem solving skills was absolutely poor. Students’ problem solving skills need to be improved through classroom learning in future research.