Document Detail

Increasing the degrees of freedom in existing group randomized trials: the df* approach.
MedLine Citation:
PMID:  15860765     Owner:  NLM     Status:  MEDLINE    
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.
Jonathan L Blitstein; Peter J Hannan; David M Murray; William R Shadish
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Evaluation review     Volume:  29     ISSN:  0193-841X     ISO Abbreviation:  Eval Rev     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-04-29     Completed Date:  2005-07-08     Revised Date:  2013-06-24    
Medline Journal Info:
Nlm Unique ID:  8004942     Medline TA:  Eval Rev     Country:  United States    
Other Details:
Languages:  eng     Pagination:  241-67     Citation Subset:  T    
Psychology of Health Behavior Program, RTI International.
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MeSH Terms
Meta-Analysis as Topic
Models, Statistical
Randomized Controlled Trials as Topic
Research Design / statistics & numerical data*
Erratum In:
Eval Rev. 2012 Dec;36(6):475-6

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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