A twitter thread summary of this paper on the accuracy of stereotypes, which I read so you don't have to: https://www.gwern.net/docs/psychology/2016-jussim.pdf …
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Stereotype accuracy is higher when measuring objective stuff as opposed to self-reported stuff. In previous older literature with studies they consider to pass certain methodology criteria, they all find significant stereotype accuracy in race, gender, and occupation.
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They find no studies on racial stereotype accuracy after 2003. In a recent gender study, they find the stereotype predictions that were inaccurate actually *underestimated* the measured difference between the genders. Age stereotypes, however, overestimated difference.
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They say the age stereotypes were consistent across culture and country. Studies are conflicted and spotty but show a trend that people are really bad at stereotyping on the national level, especially when self-stereotyping (e.g., Italians' stereotypes about Italians')
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Political stereotypes tend to be accurate but exaggerated, and one study finds activists to tend to exaggerate their stereotypes even more. The difference in exaggerated stereotypes between repubs. and democs. is... stereotypical; the right exaggerates the left's stances on-
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crime prevention and military, and the left exaggerates the right's stances on public education and inequality, to the extent that they hit the 'inaccurate' threshhold. Also, people consistently seem to believe other people hold more exaggerated stereotypes than they actually do.
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They say stereotype accuracy is one of the largest and most replicable effects in all of social psychology, and compare it as stronger than other, more famous and relied-upon research. (e.g., attribution errors).
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Ok I got bored; skimming through the rest it seems to be mostly repetitive and discusses various pros and cons to existing studies. If you have any questions you can go read this yourself; they're moderately detailed about all the claims I listed above.
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One problem with the stereotype accuracy literature is that this threshold seems too low. If one finds, r=0.4, then this means that 16% of the stereotyoe is due to truth and 84% of the stereotype is inaccurate.
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This is a large effect size for psychology, but psychology usually studies things that a different but might cause each other. For the purpose of causation, relatively small effects are useful.
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