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Evaluation Review, Vol. 2, No. 1, 153-166 (1978)
DOI: 10.1177/0193841X7800200109

Attrition

Identification and Exploration in the National Follow Through Evaluation

Robert G. St. Pierre

Abt Associates Inc.

Elizabeth C. Proper

Abt Associates Inc.

The possible biasing effects of attrition of subjects in experiments is a problem to which social science researchers and evaluators rarely attend. A study of the relationships between attrition rate and background variables for children participating in the Nation al Follow Through Evaluation revealed that in general there were few differences between students who dropped out of treatment and comparison groups.


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