Group Comparability

John W. Graham, Brian R. Flay, C. Anderson Johnson, William B. Hansen and Linda M. Collins
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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

Evaluation Review, 1984, vol. 8, issue 2, 247-260

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.

Date: 1984
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Persistent link: https://EconPapers.repec.org/RePEc:sae:evarev:v:8:y:1984:i:2:p:247-260

DOI: 10.1177/0193841X8400800206

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