When I first looked at that graph I had no explanation for the sudden drop, but then I realized the missing years between 2016 and 2022 got me. I think what we’re looking at is a bit of a bump in 2022 (possibly due to the smaller sample) and then a return to where we were in 2016. Is that a just-so story? Eh, possibly.
Doesn’t it look like the second and third quartiles are lower than they used to be? Like, AFAICT, if you ignore 2022, you just have downward trends in those quartiles of reported IQ.
Right: If you ignore 2022, then the drop isn’t as sudden. If you’re just looking at 2022 and 2023 and comparing those two, the IQ quartiles drop about five points across the board. 2023 is lower than 2016, but not “hot damn look at that chart” lower, just “huh, yeah I guess I can see it if I zoom out or squint” lower.
Doesn’t it look like the second and third quartiles are lower than they used to be? Like, AFAICT, if you ignore 2022, you just have downward trends in those quartiles of reported IQ.
Right: If you ignore 2022, then the drop isn’t as sudden. If you’re just looking at 2022 and 2023 and comparing those two, the IQ quartiles drop about five points across the board. 2023 is lower than 2016, but not “hot damn look at that chart” lower, just “huh, yeah I guess I can see it if I zoom out or squint” lower.