Abstract
This research aims to describe the quality of critical thinking skill test of fluid mechanics material in senior high schools in Makassar City. The emphasis is the content validity aspect, the characteristics of each item for the One-Parameter Logistic (1PL) model, the Two-Parameter Logistic (2PL) model, dan the Three-Parameter Logistic (3PL) model. It is a descriptive quantitative research with the subject of all student responses to the critical thinking skills test of fluid mechanics material at senior high schools in Makassar City. There were 726 student responses. The data were collected online by google form and analyzed by using descriptive quantitative technique. The results showed that the critical thinking skill test of fluid mechanics material had fulfilled the content validity. Analysis of the quality of CTS test items showed that the models of 1PL, 2PL, and 3PL were all consistent, showing that the test items were mostly able to discriminate the high abilitytestees from the low abilitytestees. Of the three logistic model approaches used to estimate the parameters of item difficulty level, item discrimination, and guess factor, the 3PL model is better than the other twomodels.
Highlights
The 21st century learning including physics learning was characterized by 4C
The aspect of test quality estimated in this research is the test information function to show the extent the information given by a test instrument when it is used to test the testees with certain ability
The test information function curve shows that if the estimation is made based on 1PL model, the Critical thinking skill (CTS) test of Fluid Mechanics material provides maximum information when applied to testees whose ability between (-1) - (+1)
Summary
The 21st century learning including physics learning was characterized by 4C. Teachers must understand the 4C: creativity and innovation, collaboration, communication, and critical thinking and problem solving (Arafah, Rusyadi, Arafah&Arafah, 2020). To meet the demands of 21st century learning, a critical thinking skill instrument was developed in fluid mechanics material in senior www.psychologyandeducation.net high school (Arafah&Kaharuddin, 2019).No researcher has ever analyzed the instrument on fluid mechanics material. This research was conducted to explore items characteristics by Item Renponse theory (IRT) approach. In this case, the One-Parameter Logistic (1PL) model, the Two-Parameter Logistic (2PL) model, and the Three-Parameter Logistic (3PL) model are used. This research aims to reveal the parameters of difficulty level of item (bi), discrimination of item (ai), and testee guess answers (ci). This research reveals the information function of item and the information function of test Apart from these parameters, the item characteristic curve (ICC) estimation is important in thisresearch
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