Aiken’s V analysis and Rasch modeling to determine the quality of physics creative thinking test instruments

Creative thinking ability is one of the important high-level thinking skills. To assess this ability, a measurement instrument in the form of a test is needed. Therefore, the study aims to evaluate the validity of the content and constructs that measure creative thinking ability using Aiken’s V index analysis and Rasch modeling. The study used a quantitative descriptive method by assessing 12 test items on the measurement material, climate change, and renewable energy. Five experts assessed material, construction, and language, and a trial was conducted on 134 student samples. The results showed that all questions were valid. Undimensionality showed results of less than 15%, the level of item suitability was stated as appropriate, and the difficulty level varied in 4 categories. The Cronbach Alpha value was 0.77, and the person and item reliability was 0.76 and 0.92, respectively. These results indicate that the test is a reliable evaluation tool and a basis for developing similar instruments. It also has practical implications in designing learning to develop students' creative thinking.