Items’ validity and reliability using rasch measurement model for factors that influence clothing disposal behaviour

The purpose of this study was conducted to assess the validity and reliability of this research instrument using the Rasch Measurement Model (RMM). This instrument will be used to measure the factors that influences young consumers towards sustainable clothing disposal behaviour. The respondents consisted of 45 students of Fashion and Textile Design Course (SRFT) and there were 43 likert scale items with five sub-constructs which are attitude, awareness of environmental issues, controlled behaviour, social norms, and social action. Therefore, Winsteps 3.73.0 software was used to analyse the reliability of the items and respondents, the separation index of items and respondents, polarity of items, items suitability, difficulty level of items and item mapping. The findings showed that the reliability index of item is 0.89 and respondent is 0.99. The results also indicate that 9 out of the 43 items were misfit due to unfulfilled the conditional value of PTMEA CORR and Infit/Outfit MNSQ and these items need to be improved after consulting with the experts. Based on the research findings, it was evident that the items are quite good, acceptable and valid to be used. Apart from this, this research also intended to create awareness among the community regarding the importance ways to dispose clothing products.