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Lydia Laurenson's avatar

“It’s my duty to pluck the tall poppies” 😯

Saviret's avatar

> When an IQ above 180 is +5.3 standard deviations, which you only find in 1 in about 40 million people, finding a large enough cohort to test for a deviation-IQ average just isn't practical; when Terence Tao's 230 is +8.6 standard deviations, or 1 in 400 quadrillion people, a substitute for ratio IQ just isn't possible.

This does not mean ratio IQ is necessary. Your mistake here is claiming Tao's ratio-calculated score of 230 is +8.6 SD, when it is not; the original score was not calculated using standard deviations, and therefore it would be incorrect to apply SD-calculated rarities to it (1/40M). You cannot compare ratio-calculated IQ scores with SD-calculated IQ scores; they are two very different measurement systems. To properly convert between the two one would need access to the scoring guidelines (to find raw scores) as well as norming population statistics (to find the standard deviation of the ratio-calculated IQ test), neither of which are public.

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