Özet:

This study aimed at examining the effect of rater training on the differential rater function (rater error) in the process of assessing the academic writing skills of higher education students. The study was conducted with a pre-test and post-test control group quasi-experimental design. The study group of the research consisted of 45 raters, of whom 22 came from experimental, and 23 came from control groups. The raters were pre-service teachers who did not participate in any rater training before, and it was investigated that they had similar experiences in assessment. The data were collected using an analytical rubric developed by the researchers and an opinion-based writing task prepared by the International English Language Testing System (IELTS). Within the scope of the research, the compositions of 39 students who were written in a foreign language (English) were assessed. Many Facet Rasch Model was used for the analysis of the data, and this analysis was conducted under the Fully Crossed Design. The findings of the study revealed that the given rater training was effective on differential rater function, and suggestions based on these results were presented.

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