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A comment on Average IQ scores seem to have been falling and population ageing may be why. Parent comment

Re:Average IQ scores seem to have been falling and populatio... by subroutine on Friday September 29, 2017 @09:56AM (#15365263)
Nonsense. If I administer an IQ test to 1000 people in their 20s, and then retested them in their 60s, I'd be performing a classic within-subject test, where I could easily assess whether test performance increases, decreases, or doesn't significantly change.
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Re:Average IQ scores seem to have been falling and populatio... by Alex3917 on Friday September 29, 2017 @02:26PM (#15367764)
My point was that let's say all 1,000 people in their 20s got every question correct, and then you retested them in their 60s and they all got every question wrong. Assuming the sample was representative of the overall population, the group's average IQ would have remained constant at 100.
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Re:Average IQ scores seem to have been falling and populatio... by KGIII on Friday September 29, 2017 @06:48PM (#15369920)
That's not quite accurate. The score adjustments are periodic, not constant. The 100 average is from some years ago, and will be adjusted some time in the future. It is not constantly changing to reflect current scores.
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