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Overconfidence effect
The overconfidence effect is a well-established bias in which a person's subjective ''confidence'' in his or her judgments is reliably greater than the objective ''accuracy'' of those judgments, especially when confidence is relatively high. For example, Overconfidence is one example of a miscalibration of subjective probabilities. Throughout the research literature, overconfidence has been defined in three distinct ways: (1) overestimation of one's actual performance, (2) overplacement of one's performance relative to others, and (3) the excessive certainty regarding the accuracy of one's beliefs − called overprecision.
The most common way in which overconfidence has been studied is by asking people how confident they are of specific beliefs they hold or answers they provide. The data show that confidence systematically exceeds accuracy, implying people are more sure that they are correct than they deserve to be. If human confidence had perfect calibration, judgments with 100% confidence would be correct 100% of the time, 90% confidence correct 90% of the time, and so on for the other levels of confidence. By contrast, the key finding is that confidence exceeds accuracy so long as the subject is answering hard questions about an unfamiliar topic. For example, in a spelling task, subjects were correct about 80% of the time, whereas they claimed to be 100% certain. Put another way, the error rate was 20% when subjects expected it to be 0%. In a series where subjects made true-or-false responses to general knowledge statements, they were overconfident at all levels. When they were 100% certain of their answer to a question, they were wrong 20% of the time.
== Overconfidence distinctions ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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