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Meta-analysis involves combining summary information for related butindependent studies. It uses different relationship to combine position measureas well as dispersion measures. The objective of this study is to discuss arelationship among the standard deviation of a data set and the standarddeviation and mean of two part of this set. The problem was proposed in asystematic review with meta-analysis that combined two studies with missingdata.

The Relationship Among the Standard Deviation of a Dataset and the Standard Deviation and Average Two Part of This Set