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Increasing the Degrees of Freedom in Existing Group Randomized Trials

Author

Listed:
  • Jonathan L. Blitstein

    (RTI International)

  • Peter J. Hannan

    (University of Minnesota)

  • David M. Murray

    (University of Memphis)

  • William R. Shadish

    (University of California, Merced)

Abstract

This study describes a method for incorporating external estimates of intraclass correlation to improve the precision for the analysis of an existing group-randomized trial. The authors use a random-effects meta-analytic approach to pool the information across studies, which takes into account any interstudy heterogeneity that may exist. This approach can be used in several different situations to estimate the degrees of freedom available for an adjusted test of the intervention effect in a study where the challenges of group-randomized trials were not fully considered when the study was planned. The authors discuss the limitations of this approach and the circumstances in which it is likely to be helpful.

Suggested Citation

  • Jonathan L. Blitstein & Peter J. Hannan & David M. Murray & William R. Shadish, 2005. "Increasing the Degrees of Freedom in Existing Group Randomized Trials," Evaluation Review, , vol. 29(3), pages 241-267, June.
    • Handle: RePEc:sae:evarev:v:29:y:2005:i:3:p:241-267
    DOI: 10.1177/0193841X04273257
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    References listed on IDEAS

    as
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