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Emil O. W. Kirkegaard's avatar

Reliability of FSIQ typically around .90-.95 depending on the measure. https://arthurjensen.net/wp-content/uploads/2020/04/Bias-in-Mental-Testing-Arthur-R.-Jensen.pdf chapter 7. However, this reliability is mostly concentrated among the average person. You see, when you use a fixed length test, the scores are more reliable around the mean as most items have difficulties near 0. Scores further from the mean are less reliable, and thus show much more regression. I don't know what the information figure looks like for WAIS, but a typical result is like this: https://www.researchgate.net/publication/320132198_Item_Response_Theory_for_Medical_Educationists/figures?lo=1 figure 3.

The second issue is that stability of intelligence is lower from childhood to adulthood, and of course, the achievement tests have a true g loading of .80. So SMPY and various gifted problems are not that predictive of later life intelligence as one would think. Early screening for giftedness is not that important.

I did some SAT math here but these are for regular test takers, not early test takers. Current max SAT corresponds to about 135 IQ. https://emilkirkegaard.dk/en/2022/04/iqs-by-university-degrees/

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Max's avatar

This a great post. Perfect length. No excess tangents. Doesnt just say “existing position is gay”, rather also includes “and here is an updated more accurate position”. 10/10 would read again.

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