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MetaWin, first published in 1997, allows the user to easily carry out all common meta-analysis calculations on multiple independent studies from a wide variety of disciplines, including medicine, ecology, and the social sciences. Version 2.0 allows users to calculate any of six different effect sizes (vs. two, as in Version 1.0) from their data, and includes its own spreadsheet editor and statistical calculator. The analysis routine is greatly expanded, and graphics (e.g., funnel plots, histograms, etc.) have been added.