Effects of a Social-Network Method for Group Assignment Strategies on Peer-Led Tobacco Prevention Programs in Schools
Thomas W. Valente, PhD,
Beth R. Hoffman, MPH,
Annamara Ritt-Olson, MA,
Kara Lichtman, MA and
C. Anderson Johnson, PhD
Thomas W. Valente, Beth R. Hoffman, Annamara Ritt-Olson, Kara Lichtman, and C. Anderson Johnson are with the Department of Preventive Medicine, School of Medicine, University of Southern California, Alhambra, Calif.

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FIGURE 1— Group assignments for 1 class.
Note. One hundred nineteen links are not shown because they did not result in group assignments.
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Copyright © 2003 by the American Public Health Association