Item Quality Analysis of IPA Test Instruments Using R Studio

Abstract

A test is a statement, task or set of tasks planned to obtain information about educational and psychological traits or attributes. The purpose of this research is to see the quality of the science test instrument items that have been tested on 8th grade students of SMPN 8 Yogyakarta and describe the results of item analysis related to the Differentiation Index (IDB), Difficulty Level Index (ITK), and distractor effectiveness. The type of research used in this study is descriptive quantitative with the help of the R program. The test instrument analyzed was in the form of 30 multiple choice questions with 4 answer choices (A, B, C and D). The subjects used were 32 students of class VIII SMPN 8 Yogyakarta. The results showed that the Differentiation Index (IDB) was 5 items in the "Good" category, and there were 25 items in the "Not Good" category. The Index of Level of Difficulty (ITK) there are 8 items in the "Medium" category, and there are 22 items in the "Easy" category. The effectiveness of distractors as many as 3 items have "Good" distractors, as many as 2 items have "Good Enough" distractors and as many as 25 items have "Not Good" distractors. Overall, it can be seen that the differential power is more dominant in the "Not Good" category as many as 25 items. For the results of the level of difficulty is at 0.709 to 1.000 with the category "Easy" as many as 25 items. For the results of the effectiveness of distractors, 25 items are dominant in the "Not Good" criteria.