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, 2018
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, 2018
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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