Analysis of Computational Thinking Instrument for High School Students using Rasch Model
Hani Sulsilah*, Arif Hidayat, Taufik Ramlan Ramalis

Universitas Pendidikan Indonesia

Abstract

This study is aimed-to construct and analyze the Computational Thinking Instrument at Physics subject using Rasch Measurement Model. The instrument was developed by the researcher to assess students^ computational thinking in eleven grade in high school on heat and transfer topics under STEM Quartet Integrated Learning. The type of the instrument is a multiple choice with multiple-choice reasoning. This test consists of 13 questions to measure five concepts of Computational Thinking which are abstraction, decomposition, algorithm, evaluation, and generalization. The test was tried out on 63 students (39 female and 24 male aged 16-18 years old) in West Java. The item of the questions on the test was analyzed using Ministep. The reliability of the Instrument can be shown at the Cronbach^s alpha, Item Reliability, Person Reliability, Item Separation, and Person Separation. The result shows that Cronbach^s alpha (KR-20) is 0.77 which means the instrument has good reliability. The value of the item reliability and person reliability are 0.72 and 0.73 which means that the item and person reliability of the instrument are sufficient. The values of the item and person separation are 1.61 and 1.66 which means that the instrument has great separation. The validity of the instrument can be seen in unidimensionality and item fit order. The unidimensionality shows that the value of Raw Variance Explain by Measure is 29.7%, the Unexplained variance 1-5 contrast is below 15% and the eigenvalues are also below 3%. Overall, 10 of 13 items of the test meet 3 criteria of the item fit order, then 3 items meet 2 of 3 criteria of the item fit order. We can conclude that this Instrument is reliable, and valid and can be used to measure students^ computational thinking on heat and transfer topics.

Keywords: Computational Thinking, Instrument, Rasch Model

Topic: Physics Education