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Abstract
For meta-analytic purposes, descriptive statistics from multiple studies are often combined in an attempt to provide better estimates for population effect sizes. When comparing means, the pooled estimate of standard deviation is often used as a metric in standardizing mean differences. For some research purposes, however, a reduction of error in estimating the population effect size could be provided if an exact solution to the pooled standard deviation were used instead of an estimate. The purpose of the present article is to outline a method for determining this exact solution.