This report focuses on data comparability of scale scores in the Teaching and Learning nternational Survey (TALIS).
Valid cross-cultural comparisons of TALIS data are vital in providing input for evidence-based policy making and in promoting the equity and effectiveness of teacher policies. For this purpose, an investigation of data comparability is a prerequisite for any meaningful cross-cultural comparison.
TALIS involves a large number of countries and economies, and has used rather strict conventional statistical methods to test comparability. Thus, many scales in TALIS do not reach the level of comparability that allows direct comparisons of scale scores. To facilitate the effective data analysis of TALIS and maximise its policy implications, this project: (1) uses a more flexible statistical method to testcomparability, and (2) investigates the level and sources of scale data incomparability.