IDEAS home Printed from https://ideas.repec.org/a/sae/evarev/v29y2005i3p241-267.html
   My bibliography  Save this article

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
    as

    Download full text from publisher

    File URL: https://journals.sagepub.com/doi/10.1177/0193841X04273257
    Download Restriction: no
    File URL: https://libkey.io/10.1177/0193841X04273257?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    References listed on IDEAS

    as
    1. Varnell, S.P. & Murray, D.M. & Janega, J.B. & Blitstein, J.L., 2004. "Design and Analysis of Group-Randomized Trials: A Review of Recent Practices," American Journal of Public Health, American Public Health Association, vol. 94(3), pages 393-399.
    2. Wu, Z. & Detels, R. & Zhang, J. & Li, V. & Li, J., 2002. "Community-based trial to prevent drug use among youths in Yunnan, China," American Journal of Public Health, American Public Health Association, vol. 92(12), pages 1952-1957.
    3. Murray, D.M. & Varnell, S.P. & Blitstein, J.L., 2004. "Design and Analysis of Group-Randomized Trials: A Review of Recent Methodological Developments," American Journal of Public Health, American Public Health Association, vol. 94(3), pages 423-432.
    4. Forster, J.L. & Murray, D.M. & Wolfson, M. & Blaine, T.M. & Wagenaar, A.C. & Hennrikus, D.J., 1998. "The effects of community policies to reduce youth access to tobacco," American Journal of Public Health, American Public Health Association, vol. 88(8), pages 1193-1198.
    5. David Draper & James S. Hodges & Colin L. Mallows & Daryl Pregibon, 1993. "Exchangeability and Data Analysis," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 156(1), pages 9-28, January.
    6. Simpson, J.M. & Klar, N. & Donner, A., 1995. "Accounting for cluster randomization: A review of primary prevention trials, 1990 through 1993," American Journal of Public Health, American Public Health Association, vol. 85(10), pages 1378-1383.
    7. Farrell, K.P. & Brophy, M.C. & Chisolm Jr., J.J. & Rohde, C.A. & Strauss, W.J., 1998. "Soil lead abatement and children's blood lead levels in an urban setting," American Journal of Public Health, American Public Health Association, vol. 88(12), pages 1837-1839.
    8. Harrell, J.S. & McMurray, R.G. & Gansky, S.A. & Bangdiwala, S.I. & Bradley, C.B., 1999. "A public health vs a risk-based intervention to improve cardiovascular health in elementary school children: The cardiovascular health in children study," American Journal of Public Health, American Public Health Association, vol. 89(10), pages 1529-1535.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Jonathan L. Blitstein & David M. Murray & Peter J. Hannan & William R. Shadish, 2005. "Increasing the Degrees of Freedom in Future Group Randomized Trials," Evaluation Review, , vol. 29(3), pages 268-286, June.
    2. repec:mpr:mprres:4632 is not listed on IDEAS
    3. Peter Z. Schochet, "undated". "Statistical Power for Random Assignment Evaluations of Education Programs," Mathematica Policy Research Reports 6749d31ad72d4acf988f7dce5, Mathematica Policy Research.
    4. Steven Teerenstra & Bing Lu & John S. Preisser & Theo van Achterberg & George F. Borm, 2010. "Sample Size Considerations for GEE Analyses of Three-Level Cluster Randomized Trials," Biometrics, The International Biometric Society, vol. 66(4), pages 1230-1237, December.
    5. Winfried Zinn & Sebastian Sauer & Richard Göllner, 2016. "The German Inpatient Satisfaction Scale," SAGE Open, , vol. 6(2), pages 21582440166, April.
    6. Ji-Hyun Lee & Michael J Schell & Richard Roetzheim, 2009. "Analysis of Group Randomized Trials with Multiple Binary Endpoints and Small Number of Groups," PLOS ONE, Public Library of Science, vol. 4(10), pages 1-9, October.
    7. Benjamin F. Arnold & Francois Rerolle & Christine Tedijanto & Sammy M. Njenga & Mahbubur Rahman & Ayse Ercumen & Andrew Mertens & Amy J. Pickering & Audrie Lin & Charles D. Arnold & Kishor Das & Chris, 2024. "Geographic pair matching in large-scale cluster randomized trials," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
    8. Ruoxuan Xiong & Susan Athey & Mohsen Bayati & Guido Imbens, 2024. "Optimal Experimental Design for Staggered Rollouts," Management Science, INFORMS, vol. 70(8), pages 5317-5336, August.
    9. Henry A. Feldman & Sonja M. McKinlay & Minoo Niknian, 1996. "Batch Sampling To Improve Power in a Community Trial," Evaluation Review, , vol. 20(3), pages 244-274, June.
    10. Mark Wolfson & Heather Champion & Todd Rogers & Rebecca H. Neiberg & Dianne C. Barker & Jennifer W. Talton & Edward H. Ip & Ralph B. D'Agostino Jr & Maria T. Parries & Doug Easterling, 2011. "Evaluation of Free to Grow: Head Start Partnerships to Promote Substance-Free Communities," Evaluation Review, , vol. 35(2), pages 153-188, April.
    11. Gautam, Jeny & Glover, Marewa & Scragg, Robert & Bullen, Chris & Gentles, Dudley & Nosa, Vili & McCool, Judith, 2014. "Parental and retail supply of tobacco to minors: Findings from a community-based social supply intervention study," Health Policy, Elsevier, vol. 117(1), pages 120-127.
    12. Uwe Saint-Mont, 2015. "Randomization Does Not Help Much, Comparability Does," PLOS ONE, Public Library of Science, vol. 10(7), pages 1-24, July.
    13. van der Laan Mark J. & Petersen Maya & Zheng Wenjing, 2013. "Estimating the Effect of a Community-Based Intervention with Two Communities," Journal of Causal Inference, De Gruyter, vol. 1(1), pages 83-106, June.
    14. Steven N. Durlauf, 2002. "On the Empirics of Social Capital," Economic Journal, Royal Economic Society, vol. 112(483), pages 459-479, November.
    15. Hélène Sancho-Garnier & Bruno Pereira & Pierre Césarini, 2012. "A Cluster Randomized Trial to Evaluate a Health Education Programme “Living with Sun at School”," IJERPH, MDPI, vol. 9(7), pages 1-17, July.
    16. Ross, Hana PhD & Chaloupka, Frank J. PhD, 2001. "The Effect of Cigarette Prices on Youth Smoking," University of California at San Francisco, Center for Tobacco Control Research and Education qt8004m9n5, Center for Tobacco Control Research and Education, UC San Francisco.
    17. Larry V. Hedges, 2009. "Adjusting a Significance Test for Clustering in Designs With Two Levels of Nesting," Journal of Educational and Behavioral Statistics, , vol. 34(4), pages 464-490, December.
    18. Wakefield, Melanie A PhD & Chaloupka, Frank J. PhD, 1999. "Effectiveness of Comprehensive Tobacco Control Programs in Reducing Teenage Smoking: A Review," University of California at San Francisco, Center for Tobacco Control Research and Education qt46n6b9mv, Center for Tobacco Control Research and Education, UC San Francisco.
    19. Jose Giovany Babativa-Márquez & José Luis Vicente-Villardón, 2021. "Logistic Biplot by Conjugate Gradient Algorithms and Iterated SVD," Mathematics, MDPI, vol. 9(16), pages 1-19, August.
    20. Sherri P. Varnell & David M. Murray & William L. Baker, 2001. "An Evaluation of Analysis Options for the One-Group-Per-Condition Design," Evaluation Review, , vol. 25(4), pages 440-453, August.
    21. Brandon A. Kohrt & Laura Asher & Anvita Bhardwaj & Mina Fazel & Mark J. D. Jordans & Byamah B. Mutamba & Abhijit Nadkarni & Gloria A. Pedersen & Daisy R. Singla & Vikram Patel, 2018. "The Role of Communities in Mental Health Care in Low- and Middle-Income Countries: A Meta-Review of Components and Competencies," IJERPH, MDPI, vol. 15(6), pages 1-31, June.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:sae:evarev:v:29:y:2005:i:3:p:241-267. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: SAGE Publications (email available below). General contact details of provider: .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.