Differential attrition: Another hazard of follow-up research

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Comments on J. McCord's (see record 1979-09057-001) field test of a delinquency prevention program, which produced a pattern of long-term negative side effects. There is an important source of experimental contamination that was not ruled out, namely, differential S attrition. Five of the negative comparisons resulted from responses to a questionnaire. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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