[farresito]

From my experience, IQ results are very inflated. Your father was probably very bright, but an IQ of 200 is very very high, so high that it is unlikely that he was that smart. An IQ of 200 means he is one of the brightest in the world, and I've read here and there about people being tested on IQ of around 220. Statistically it's not possible.

[nobodysfool]

I believe the word you mean is improbable. Nothing is impossible. And you may be using the later versions of the test. I'm not saying he was the smartest in the world, in fact, it may have been a flaw of the test. It was when the tests were being first developed. Regardless of what his intelligence was (it's far lower now thanks to a stroke he had a few years back) I'm just saying that it doesn't mean as much as it did.

[gwern]

> It was when the tests were being first developed.

So it was a ratio test, not a modern deviation test? (As makes sense since no accepted deviation test goes up to 200 in the first place...) A 200 would be nothing exceptional: it just meant he was substantially better than his year-bracket - a 4 year old acting like an 8 year old, a 5yo like 10yo, etc. Not that he was Einstein.