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The 1981 article "Average IQ values in various European countries" by Vinko Buj is the only international IQ study that over a short time period has compared IQs using the same IQ test. Rindermann (2007) states that it is of dubious quality with scant information regarding how it was done. [3] [4]
Some criticisms have focused on the limited number of studies upon which the book is based. The IQ figures are based on 3 different studies for 17 nations, two studies for 30 nations, and one study for 34 nations. There were actual tests for IQ in the case of 81 countries out of the 185 countries studied.
By the 1937 second revision of the Stanford–Binet test, Terman no longer used the term "genius" as an IQ classification, nor has any subsequent IQ test. [65] [95] In 1939, Wechsler wrote "we are rather hesitant about calling a person a genius on the basis of a single intelligence test score." [96]
A number of IQ studies have been done on the effect of similar rearing conditions on children from different races. The hypothesis is that this can be determined by investigating whether black children adopted into white families demonstrated gains in IQ test scores relative to black children reared in black families.
A Daily News analysis of vaccination data and IQ averages in each state reveals new patterns among anti- and pro-vaxxers, with five of the 10 states with the lowest IQs landing among the 10 states ...
Early IQ tests were also used to argue for limits to immigration to the US. Already in 1917, Goddard reported on the low IQ scores of new arrivals at Ellis Island. Yerkes argued on the basis of his army test scores that there were consistently lower IQ levels among those from Southern and Eastern Europe, which he suggested could lead to a ...
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The study on religion and intelligence has been ongoing since the 1920s and conclusions and interpretations have varied in the literature due to different measures for both religiosity and intelligence. [4] Some studies find negative correlation between intelligence quotient (IQ) and religiosity.