Abstract. The bulk of conceptual and statistical developments as well as applications of meta-analysis have been published in the last 30 years. The methods for meta-analysis continue to be refined and new methods are applied to new types of research ...

Abstract. To conduct a meta-analysis, one needs to express the results from a set of related studies in terms of an outcome measure, such as a standardized mean difference, correlation coefficient, or odds ratio. The observed outcome from a single study ...

Abstract. This paper considers meta-analysis of binary data that use a dichotomized continuous score. Classification into two categories, e.g., qualified or not qualified, is often based upon a threshold or cut-off value. This threshold might vary between ...

Abstract. Interest in the prediction of academic success in higher education has grown considerably in recent years in German-speaking countries. While the validity of school grades and admission tests has been investigated by meta-analyses and large-...