gwern comments on [Link] FreakoStats and CEV - Less Wrong
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Ah! Indeed, without the distributions - from dumb to smart -, one can't be much certain. However, in many (if not all) cases he doesn't merely calculate what the smart vote is. He analyses and interprets it, and in a very artful way (the guy is smart), although sometimes art is not really necessary, e.g. as in an graph of an increasing monotonical dumb-smart function.
Anyway, you do raise an obvious problem: even if a graph dumb-smart represented something like a monotonic function, how would one know that, after a while, eg. at the 300 IQ point, there isn't going to be a radical change?
Current IQ tests are pretty meaningless past >160, so as long as this works in the 70-160 range, we're fine.
That we cannot measure intelligence reliably after a certain point does not imply that there are not (infinite?) levels of intelligence after it. There are certainly - at least theoretically - levels of fluid intelligence that correspond to IQs of 170, 180, 300..., and it was in this theoretical sense that I raised my question.