Meta-Analysis Resources

Tools for Those Who Summarize the Evidence Base

Resources and networking for those who conduct or interpret meta-analyses related to any phenomenon that is gauged in multiple studies.

Michael Köhler
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  • Bielefeld
  • Germany
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Michael Köhler added a discussion to the group Calculating Effect Sizes and Their Variances or Standard Errors

Relative high weights in pre-post scores studies

Hi there,I'm working on a meta-analysis where i combine different designs: independent groups (treatment and control group) on the one hand and only dependent pre post without control group on the other. For both study types I computed hedges' g according to Borenstein et al. (2009).As prescribed for studies that use pre post scores I used the correlation between pre- and post-scores to compute the standard deviation within groups and the variance of d. To compute the weight for each study I…See More
Feb 7
Michael Köhler joined Blair T. Johnson's group

Calculating Effect Sizes and Their Variances or Standard Errors

Tips and techniques to help meta-analysts calculate effect sizes and the variances that are needed for the purpose of analysis.See More
Feb 7
Michael Köhler updated their profile
Nov 27, 2017
Michael Köhler is now a member of Meta-Analysis Resources
Nov 27, 2017

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