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Source effects in communication and persuasion research: A meta-analysis of effect size

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Abstract

The effect of a message source on the persuasion of a target audience has been a topic of interest to scholars in psychology, consumer behavior, and communications for many years. Narrative reviews of this literature are available; the contribution of this study is that we present a quantitative review of studies of source effects on persuasion. One of our research goals is to determine how strong and consistent source manipulations tend to be. We find that, on average, source manipulations account for nine percent of explained variance among studies reporting significant findings. In particular, expertise tends to have the greatest effect on persuasion with an average of 16 percent of the explained variance being due to the expert versus non-expert manipulation. As well as gaining insight into the pattern of results across a body of literature, our findings may be used as benchmarks by researchers, as advocated by Sawyer and Ball (1981), to evaluate results of future persuasion studies employing a source manipulation.

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Authors and Affiliations

  1. Louisiana State University, USA

    Elizabeth J. Wilson (Assistant Professor of Marketing) & Daniel L. Sherrell (Associate Professor of Marketing)

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  1. Elizabeth J. Wilson
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  2. Daniel L. Sherrell
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She received a Ph.D. in Business Administration from the Pennsylvania State University in 1989. Dr. Wilson’s research interests include persuasion processes, meta-analysis, and issues in business marketing. Her work has been published in theJournal of the Academy of Marketing Science, Journal of Marketing Research, Marketing Letters, and elsewhere.

He received a Ph.D. in Business Administration from the University of South Carolina in 1980. Dr. Sherrell’s research interests include consumer behavior, retailing, and marketing management. His work has been published in theJournal of the Academy of Marketing Science, Journal of Consumer Research, Psychology and Marketing, and elsewhere.

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Wilson, E.J., Sherrell, D.L. Source effects in communication and persuasion research: A meta-analysis of effect size. JAMS 21, 101–112 (1993). https://doi.org/10.1007/BF02894421

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