As for the IQ question and especially the self-reported IQ, it did not take into account that IQ should come at least with standard deviation. Otherwise it’s like asking for a height number without saying if it is in centimeters, meters, or feet. It’s understandable that people who didn’t study psychometrics with some depth don’t know this, though.
IQ can be a ratio IQ or a deviation IQ. In the first case it is mental age divided by actual age, with the normalcy as 100. This is still used mostly for children, but it’s still possible to see such scores. Deviation IQ is more common and it’s supposed to measure one’s intelligence according to rarity in a population.
Sometimes these tests are standardized for certain countries, in which case an IQ score only has relevance in relation to that country’s population, but generally the standard is the population of England or the USA, with its average being 100. Other countries have averages ranging from about 67 to 107 (s.d. 15), compared to it. The average IQ score of the world is estimated at about 90, but there are also differences in standard deviation among different populations, some have bigger variation than others, and also between the sexes (men have a slightly higher standard deviation).
Standard deviations used are 15, 16, and 24. For instance, an IQ score one standard deviation above 100 could be 115, 116, or 124. An IQ of 163 in s.d. 15 corresponds to an IQ of 167 in s.d. 16, or an IQ of 200 in s.d. 24, which, in average, correspond to a ratio IQ of 185. When estimating the true world rarity of IQ scores, though, very lengthy and complex estimations would need to be made, otherwise the scores only reflect the rarity in England or in the USA, and not in the world. When it comes to scores higher than two or three standard deviations above the average, most IQ tests are inadequate and insufficiently standardized to measure them and their rarity well.
This information is for your curiosity. The relevant point is that the self-reported IQ scores quite possibly were stated in differing standard deviations.
As for the IQ question and especially the self-reported IQ, it did not take into account that IQ should come at least with standard deviation. Otherwise it’s like asking for a height number without saying if it is in centimeters, meters, or feet. It’s understandable that people who didn’t study psychometrics with some depth don’t know this, though.
IQ can be a ratio IQ or a deviation IQ. In the first case it is mental age divided by actual age, with the normalcy as 100. This is still used mostly for children, but it’s still possible to see such scores. Deviation IQ is more common and it’s supposed to measure one’s intelligence according to rarity in a population.
Sometimes these tests are standardized for certain countries, in which case an IQ score only has relevance in relation to that country’s population, but generally the standard is the population of England or the USA, with its average being 100. Other countries have averages ranging from about 67 to 107 (s.d. 15), compared to it. The average IQ score of the world is estimated at about 90, but there are also differences in standard deviation among different populations, some have bigger variation than others, and also between the sexes (men have a slightly higher standard deviation).
Standard deviations used are 15, 16, and 24. For instance, an IQ score one standard deviation above 100 could be 115, 116, or 124. An IQ of 163 in s.d. 15 corresponds to an IQ of 167 in s.d. 16, or an IQ of 200 in s.d. 24, which, in average, correspond to a ratio IQ of 185. When estimating the true world rarity of IQ scores, though, very lengthy and complex estimations would need to be made, otherwise the scores only reflect the rarity in England or in the USA, and not in the world. When it comes to scores higher than two or three standard deviations above the average, most IQ tests are inadequate and insufficiently standardized to measure them and their rarity well.
This information is for your curiosity. The relevant point is that the self-reported IQ scores quite possibly were stated in differing standard deviations.