@TechReport{iza:izadps:dp2198,
            	author={Konstantopoulos, Spyros},
            	title={Fixed and Mixed Effects Models in Meta-Analysis},
            	year={2006},
	month={Jul},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={2198},
            	url={https://www.iza.org/publications/dp2198},
	abstract={The last three decades the accumulation of quantitative research evidence has led to the development of systematic methods for combining information across samples of related studies. Although a few methods have been described for accumulating research evidence over time, meta-analysis is widely considered as the most appropriate statistical method for combining evidence across studies. This study reviews fixed and mixed effects models for univariate and multivariate meta-analysis. In addition, the study discusses specialized software that facilitates the statistical analysis of meta-analytic data.},
	keywords={meta-analysis;multivariate analysis;mixed models},
            }