Categorical induction from uncertain premises: Jeffrey's doesn't completely rule

Thinking and Reasoning 20 (4):405-431 (2014)

Studies of categorical induction typically examine how belief in a premise (e.g., Falcons have an ulnar artery) projects on to a conclusion (e.g., Robins have an ulnar artery). We study induction in cases in which the premise is uncertain (e.g., There is an 80% chance that falcons have an ulnar artery). Jeffrey's rule is a normative model for updating beliefs in the face of uncertain evidence. In three studies we tested the descriptive validity of Jeffrey's rule and a related probability theorem, the rule of total probability. Although these rules provided good approximations to mean judgments in some cases, the results from regression and correlation analyses suggest that participants focus on the parts of these rules that are associated with the highest overall probability. We relate our findings to rational models of judgment
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DOI 10.1080/13546783.2014.884510
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New Paradigm Psychology of Reasoning.David E. Over - 2009 - Thinking and Reasoning 15 (4):431-438.

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