Dissemination of symbolic representation ability in high school physics subjects

The purpose of this study is to look at the validity and reliability of the symbolic representation ability test instrument, as well as the spread of the symbolic representation abilities of high school students. The research method used is the development of test instruments. Nine items were developed with 5 alternative answers. The physics material being tested is Newton's Law of Motion. The results of the validation analysis showed that the instrument developed was valid, with Aiken's V value greater than 0.88. Also, the instrument developed was compatible with the Rasch model. The characteristics of the difficulty index test items are in the good category. The reliability of the instrument is 0.70, and is feasible to be used to measure the symbolic representation ability of students with a minimum ability of -1.25. The trial was conducted on 62 students of SMA Negeri 1 Banguntapan. The average measurement result of the symbolic representation ability of students in high school physics subjects is -0,001 +/- 0,144. It can be concluded that the symbolic representation ability of students of SMA Negeri 1 Banguntapan in physics is in the medium category.