A Review of Measurement Tools Developed and Adapted Based on the Rasch Model

Abstract

It is often observed that the Rasch model is frequently used in determining the psychometric properties of measurement tools because the Rasch model has many advantages in the development and adaptation of measurement instruments. The aim of this study is to evaluate the theses included in the National Thesis Center, which examine the psychometric properties of measurement tools within the framework of the Rasch model, within the scope of the requirements of the Rasch model. In line with this purpose, the model of the research is a document analysis research within the scope of qualitative research. All theses containing the word Rasch in the thesis name and index were examined, and 24 theses in which the measurement tool was developed and adapted within the scope of the Rasch model were found. In order to examine these measurement tools, a coding list was created and the data was analyzed by applying categorical analysis which is one of the content analysis methods. According to the results obtained, it was revealed that in the majority of theses, information was given about unidimensionality, but in half of the theses, no information was given about the local independence assumption. There are studies that do not specify which model is used for polytomous items, and it was observed that model comparison was not performed. It was determined that item model fit was generally tested with different approaches in the theses, and item parameters were generally included. It is among the results that the Person separation index related to reliability was not reported in all studies, and sufficient information was not provided in some studies, even though Differential Item Functioning analyses were performed. In light of these results, it is seen that there is no common systematic approach in the development or adaptation of measurement tools within the framework of the Rasch model in the studies. Therefore, it is recommended that more detailed studies explaining this systematic approach should be conducted.