Maximizing both external and internal validity in longitudinal true experiments with voluntary treatments: the ''combined modified'' design

Author： Neumann N.F. Belosevic M. Braver S.L. Smith M.C.

Publisher： Elsevier

ISSN： 0149-7189

Source： Evaluation and Program Planning, Vol.19, Iss.4, 1996-11, pp. : 287-300

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