Development and Validation of Public Speaking Performance Instruments based on Rasch Model

Abstract

This study aims to see the ability of students public speaking performance, so that the development and validation of the instrument is carried out for the evaluation of the learning. This type of research is quantitative through a survey of 976 students of communication study programs at universities in the DKI Jakarta area. The results show that the instrument developed from the modification of 43 items to 33 items has met the psychometric validity requirements with Rasch modeling. The monotonic is fulfilled by each item on the public speaking instrument through the Andrich Threshold criteria, so that the instrument with the developed response scale does not provide answers that are confusing to respond.