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Yildiz Yildirim; Melek Gülsah Sahin – International Journal of Psychology and Educational Studies, 2023
There is increasing interest in meta-analysis in different fields due to the need to combine the results of primary research. One of the crucial concepts in combining results is weighting. This study examines how Hunter and Schmidt's method, weighting by sample size; Hedges and Vevea's method, weighting by inverse variance; and Osburn and…
Descriptors: Foreign Countries, Weighted Scores, Meta Analysis, Effect Size
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Drent, Marjolein; Meelissen, Martina R. M.; van der Kleij, Fabienne M. – Journal of Curriculum Studies, 2013
Worldwide, the interest of policy-makers in participating in studies from the International Association for the Evaluation of Educational Achievement (IEA), such as Trends in International Mathematics and Science Study (TIMSS) has been growing rapidly over the past two decades. These studies offer the opportunity to relate the teaching and…
Descriptors: International Programs, Mathematics Achievement, Science Achievement, Data Analysis