The relative benefits of meta-analysis conducted with individual participant data versus aggregated data.

@article{Cooper2009TheRB,
  title={The relative benefits of meta-analysis conducted with individual participant data versus aggregated data.},
  author={Harris Cooper and Erika A. Patall},
  journal={Psychological methods},
  year={2009},
  volume={14 2},
  pages={165-76}
}
The authors describe the relative benefits of conducting meta-analyses with (a) individual participant data (IPD) gathered from the constituent studies and (b) aggregated data (AD), or the group-level statistics (in particular, effect sizes) that appear in reports of a study's results. Given that both IPD and AD are equally available, meta-analysis of IPD is superior to meta-analysis of AD. IPD meta-analysis permits synthesists to perform subgroup analyses not conducted by the original… CONTINUE READING

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