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Three major meta-analytic approaches have been developed and applied to integrate empirical research. A comparison of their statistical formulas suggested that they should yield different answers to the meta-analytic questions of central tendency, variability, and prediction by moderators. These frameworks were used to analyze systematically differing databases and showed that, although the techniques of L. V. Hedges and I. Olkin (1985) and of R. Rosenthal and D. Rubin (e.g., 1978Rubin (e.g., ,doi:10.1037/0021-9010.80.1.94 fatcat:6ibnacpdqjaa5l6ngvlcd2lxny