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Developed to offer researchers an informative account of which methods are most useful in integrating research findings across studies, this book will enable the reader to apply, as well as understand, meta-analytic methods. Rather than taking an encyclopedic approach, the authors have focused on carefully developing those techniques that are most applicable to social science research, and have given a general conceptual description of more complex and rarely-used techniques. Fully revised and updated, the text includes new these new additions: an evaluation of fixed versus random effects models for meta-analysis; new methods for correcting for indirect range restriction in meta-analysis; new developments in corrections for measurement error; a discussion of a new Windows-based program package for applying the meta-analysis methods presented in the book; a presentation of the theories of data underlying different approaches to meta-analysis.