Abstract:

Instrument construct is one of the most important issues in conducting research. Without properly considering the issue, the instrument would be difficult to be considered valid and reliable. If construct validity is accurate, then it will provide a clearer and more precise descriptive analysis on the concepts investigated. The most important criteria to be considered in answering the construct validity are reliability and validity. In the traditional measurement model, the understanding of reliability and validity is completely different from the one offered by the Rasch model. Regardless of the difference, internal consistency is still widely used as the primary method to measure the item sampling. Using this model, local dependence and item fit are the most considered when obtaining validity, reliability, and consistency. Therefore, the model is significant. The study also applies goodness of measure to answer issues related to validity and reliability tests. Principal components analysis is carried out to test the construct of questionnaires used in the study.