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Group Comparability

Author

Listed:
  • John W. Graham

    (Health Behavior Research Institute University of Southern California)

  • Brian R. Flay

    (Health Behavior Research Institute University of Southern California)

  • C. Anderson Johnson

    (Health Behavior Research Institute University of Southern California)

  • William B. Hansen

    (Health Behavior Research Institute University of Southern California)

  • Linda M. Collins

    (Health Behavior Research Institute University of Southern California)

Abstract

It is not always possible, especially in large-scale evaluation research, to ensure that random assignment will produce groups that are comparable on any number of potentially important factors. Typically, gaining comparability has been achieved only at the expense of random assignment. A method is presented that allows multivariate comparability while making only minimal restrictions on randomization. The procedure is demonstrated in the context of assigning 63 aggregated units (schools) to 28 experimental and control conditions. Good comparability of groups for all primary main effects and interactions was venfied for 15 individual variables.

Suggested Citation

  • John W. Graham & Brian R. Flay & C. Anderson Johnson & William B. Hansen & Linda M. Collins, 1984. "Group Comparability," Evaluation Review, , vol. 8(2), pages 247-260, April.
    • Handle: RePEc:sae:evarev:v:8:y:1984:i:2:p:247-260
    DOI: 10.1177/0193841X8400800206
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