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A behavioral demonstration of overconfidence in judgment
1The Wharton School, University of Pennsylvania, PA 19104, USA. albert.mannes@gmail.com
Psychological Science
|June 1, 2013
Summary
People exhibit overprecision, an excessive confidence in their knowledge, leading to less accurate estimates. This study reveals subjective confidence drives this overestimation, impacting real-world decisions.
Area of Science:
- Cognitive Psychology
- Behavioral Economics
- Decision Science
Background:
- Overprecision, a form of overconfidence, is characterized by excessive certainty in one's knowledge.
- It is a durable yet poorly understood cognitive bias impacting decision-making.
- Existing research methods face challenges in accurately reflecting how uncertainty influences choices.
Purpose of the Study:
- To introduce a novel approach for studying overprecision.
- To better understand the influence of uncertainty on everyday choices.
- To investigate the relationship between subjective confidence and estimation accuracy.
Main Methods:
- Measuring judgment precision through people's adjustments to point estimates.
- Incorporating the costs associated with overestimation and underestimation.
- Analyzing how individuals modify their estimates based on potential outcomes.
Main Results:
- Demonstrated robust evidence of overprecision in participants' judgments.
- Found that individuals adjusted their estimates significantly less than warranted by their actual knowledge.
- Identified subjective confidence as the primary driver of this under-adjustment.
Conclusions:
- Overprecision is a prevalent cognitive bias significantly affecting judgment accuracy.
- Subjective confidence plays a critical role in the manifestation of overprecision.
- The findings offer a more ecologically valid method for studying overprecision and its impact on decisions.
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