The Construct Inventory of Self Determination (ISD) Using Application Winsteps: Rasch Model

Abstract

This study are weaknesses from the classical theory approach in analyzing the validity and reliability of the instrument, which includes the test items which are highly dependent on the characteristics of the subject being tested, the estimated ability of the test participants is highly dependent on the test items being tested, and the information presented is limited to answering right or wrong not paying attention to the pattern of the test takers' answers is the reason for using the theory of the modern Rasch model in analyzing the validity and reliability of self-determination instruments. This study used a quantitative approach with a cross-sectional design with a total of 125 participants. Analysis using the Rasch Model is assisted by Winstep software version 3.73. The results of the self-determination of the instrument through the Rasch model were analyzed based on unimentionality aspects, item analysis (level of item difficulty and item suitability level), as well as instrument analysis. The results stated that the instrument developed had been tested for validity and reliability so that it could be used as a measuring tool to measure the self-determination ability of students who were teenagers.