Psychometric Properties of Character Strength Instruments Using the Rasch Model
Keywords:
Character Strength, Psychometric Properties, Rasch Model, Response ScalingAbstract
The summed rating method is popularly known as the Likert scaling model. The characteristics of the data on the Likert scale are the characteristics of ordinal data, or rank order data. One of the efforts to make the data into interval data on the results of psychological measurements is to do a scaling process. This study aims to scaling ordinal data on the Likert scale to logit data using the Rasch model as well as testing the psychometric properties of the Character Strength instrument. Character Strength Measurement, in this study using the Values in Action Inventory Strength of Youth (VIA-Youth) developed by Park and Peterson, consisting of 24 character strengths of 34 items. Respondents in this study were students at Widya Dharma Klaten University, totaling 375 people. The psychometric properties used in this study consisted of item analysis and instrument analysis, using Winstep Software. Item analysis includes: item difficulty level, item suitability level. Instrument analysis includes: unidimensionality, rating scale testing, reliability (respondents and items), and information functions. Overall the psychometric property results of the Character Strength instrument are included in the good category according to the criteria in the Rasch modeling.
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