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Propagation of Individual Bias through Group Judgment: Error in the Treatment of Asymmetrically Informative Signals
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The evidence that individuals systematically violate Bayes' theorem under certain conditions is surveyed and two experiments designed to test whether individuals follow Bayesian reasoning and whether groups are able to overcome biased individual information processing are reported.Abstract:
Group decision making is commonly used in juries, businesses, and in politics to increase the informational basis for a decision and to improve decision accuracy. Recent work on generalizing Condercet's jury theorem provides a compelling justification for using groups in this manner. But these theories rely on a model of the individual as an optimal Bayesian decision maker. Do groups effectively aggregate information when the individuals are the flawed, non-Bayesian decision makers that actually populate acting groups? We first survey the evidence that individuals systematically violate Bayes' theorem under certain conditions. We then report two experiments designed to test whether individuals follow Bayesian reasoning and whether groups are able to overcome biased individual information processing. The experiments show that under certain conditions, with extreme probabilities and with signals that vary in diagnositicity, that individual accuracy actually deteriorates as information increases. For certain problems, majority rule effectively aggregates individual information. For the most difficult problems, majority rule fails to attenuate individual bias. The implications of these findings for research on individual and group judgment are discussed.read more
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References
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Book
Simple Heuristics That Make Us Smart
Gerd Gigerenzer,Peter M. Todd +1 more
TL;DR: Fast and frugal heuristics as discussed by the authors are simple rules for making decisions with realistic mental resources and can enable both living organisms and artificial systems to make smart choices, classifications, and predictions by employing bounded rationality.
Book
A Treatise on Probability
TL;DR: In this article, the authors present a constructive theory of probability in the theory of groups, with special reference to logical consistence, inference, and logical priority, and the fundamental theorems of probable inference and probability.
Journal ArticleDOI
Confirmation, Disconfirmation, and Information in Hypothesis Testing
Joshua Klayman,Young Won Ha +1 more
TL;DR: The authors showed that the positive test strategy can be a very good heuristic for determining the truth or falsity of a hypothesis under realistic conditions, but it can also lead to systematic errors or inefficiencies.
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On the failure to eliminate hypotheses in a conceptual task.
TL;DR: The results showed that those subjects, who reached two or more incorrect conclusions, were unable, or unwilling to test their hypotheses, and the implications are discussed in relation to scientific thinking.
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