Last time I actually pulled an excel was when Taleb was against IQ and said its only use is to measure low IQ. I wanted to see if this could explain (very) large country differences. So I made a trivial model where you have parts of the population affected by various health issues that can drop the IQ by 10 points. And the answer was yes, if you actually have multiple causes and they stack up, you can end up with the incredibly low averages we see (in the 60s for some areas).
I’m glad that I asked the alternative phrasing of my question, because this anecdote is informative!
I’m glad that I asked the alternative phrasing of my question, because this anecdote is informative!