www.sfgate.com/news/article/Incompetent-People-Rea…5.php

""Not only do they reach erroneous conclusions and make unfortunate choices, but their incompetence robs them of the ability to realize it," wrote Kruger, now an assistant professor at the University of Illinois, and Dunning. On the humor test, in which participants were asked to rate jokes according to their funniness (subjects’ ratings were matched against those of an "expert" panel of professional comedians), low-scoring subjects were also more apt to have an inflated perception of their skill. The researchers attributed this to the fact that, in the absence of information about how others were doing, highly competent subjects assumed that others were performing as well as they were — a phenomenon psychologists term the "false consensus effect." […] a short training session in logical reasoning did improve the ability of low-scoring subjects to assess their performance realistically, they found. […] the research meshes neatly with other work indicating that overconfidence is common; studies have found, for example, that the vast majority of people rate themselves as "above average" on a wide array of abilities — though such an abundance of talent would be impossible in statistical terms. Dr. David C. Funder, a psychology professor at the University of California at Riverside, for example, said he suspects that most lay people have only a vague idea of the meaning of "average" in statistical terms."

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