Oral presentation 'Meta-analysis and meta-regression' during 3rd International CONOPP workshop at NIDI. Workshop about the core topics and future plans of the CONOPP project. Participants: Francesco Billari (Bocconi University), Anne Gauthier (NIDI), Harry Ganzeboom and Cees Elzinga (VU University Amsterdam), Nicole Hiekel (University of Cologne).