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Evaluation Review
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Use and Misuse of No-Difference Findings in Eliminating Threats To Validity

William H. Yeaton

University of Michigan, Center for Research on Utilization of Scientific Knowledge

Lee Sechrest

University of Arizona

Donald Campbell and his colleagues have elaborated an approach to research based on the elimination of threats to four validity types: internal, external, construct, and statistical conclusion. The central thesis of this article is that the process of eliminating validity threats depends fundamentally on no-difference findings, a fact that, unfor tunately, has not been made explicit by researchers. The implications of this neglect are explored using examples from a number of different substantive areas such as psychology, health, and medicine. Finally, the intrinsic role of no-difference findings is described in the context of all four validity types, and suggestions for improving the process are offered.

Evaluation Review, Vol. 10, No. 6, 836-852 (1986)
DOI: 10.1177/0193841X8601000608
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