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Methods of Accumulating Results Across Research Domains
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Converting Study Statistics to Effect size r

In a meta-analysis the literature base is thoroughly searched for experimental and correlational studies that are relevant to the investigation. These studies become the data base for the subsequent analysis. Studies reporting on the reliability of the measures used in the various studies and their standard deviations (for range deviation adjustments) in either or both variables are included in this database.

Once the study database is assembled, the next step is to convert the individual study statistic to a common metric for later accumulation. Table 1 shows several of the more common methods of converting the individual study statistic to r.

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