Measuring Reliability and Validity of Questionnaire on Teacher Digital Professional Development: A Rasch Model Analysis

Abstract

In this study, the validity and reliability of a questionnaire on Teacher Digital Professional Development (TDPD) were empirically examined using Rasch model analysis. The questionnaire was filled out by 125 primary school teachers in total. For this particular survey, the questionnaire was adapted. Three experts who specialise in educational technology have validated the content. The TDPD has great reliability within six constructs, based on the data analysis performed using WINSTEP software version 3.71.01. It was found that the TDPD is reliable and can be accepted based on the person reliability of 0.95 and the item reliability of 0.81. However, one element had to be eliminated after being subjected to the Rasch model analysis, while the remaining items could be maintained. Researchers will be able to use or adapt this high-quality instrument in their research if reliable and valid instrumentation is assured.