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This study aims to measure students' ability in creative thinking on the subject matter of elasticity Hooke law through statistic descriptive using the Rasch model. The students' creativity is determined by logit parameter providing a similar scale. The instrument used was an essay test developed from Torrance indicators. This research involved 35 students including 17 females and 18 males who had prior knowledge about this subject. To obtain the objective, firstly, the analysis of validity and reliability items was conducted for the instrument. The construct validity was obtained by Mean Square (MNSQ) values, and reliability was determined by three indicators including person reliability, item reliability, and alpha Cronbach values. The results of the analysis show that the instrument having been tested is valid because the MNSQ values are in the accepted range which infit and outfit person values are 0,97 and 1,02 as well as infit and outfit item values are 0,98 and 1,02, and the instrument is also reliable in good criteria with 0,83 value. The analysis of person reliability and item reliability shows that the students' answers are consistent and the quality of questions is good namely 0,83 and 0,89, respectively. Furthermore, the logit value indicates that there is a tendency of students having a lower ability than the difficulty level of the questions. This implies that the teachers should put more effort to improve creative thinking students in further learning activities as the creative thinking skill is important to prepare students in their future career. Also, the instrument developed can be utilized to measure creative thinking skill in the similar subject matter. [ABSTRACT FROM AUTHOR]