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To add to the existing answers (of which @what's gets special mention), an issue I don't think has really been addressed is the statistical reason for it being so difficult to measure extremely high IQs. By design, IQ is scaled so that it's normally distributed, with a mean of 100, and a standard deviation (SD) of 15. A well known feature of the normal ...


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The oldest and largest high IQ society in the world is Mensa. They offer membership only to those who have an IQ in the top 2%. They administer their own test to qualify those who seek membership. There are also online IQ tests that claim to be Mensa IQ tests, but I am unsure of their validity. However, Mensa only recognize the results of tests that they ...


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Have a look at the different High IQ societies here: http://rationalwiki.org/wiki/High_IQ_society The best societies to look at for 160+ are: eximia high IQ society Mega Society GenerIQ Society Giga Society (http://www.gigasociety.com/) [I can't add more than 2 links] They all have references to test (some of it is online). For ease of access, here ...


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Obtaining the quartiles: Typically you obtain quartiles from the data. Thus, you would have sample data (either your dataset or another dataset), and you can use software to give you .25 and .75 percentiles (or alternatively, you can get such values fairly straightforwardly by rank ordering the data). Of course, you might be referring to a slightly ...



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