How should I interpret Figure 8?<p><a href="https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0281779.g008" rel="nofollow">https://journals.plos.org/plosone/article/figure?id=10.1371/...</a><p>If the difference between the 2012 and 2020 cohorts is roughly the same as between the 2012 and 2002 cohorts, why should I suspect this isn't just a failure to pick comparable cohorts across the decades?
Link to study<p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0281779" rel="nofollow">https://journals.plos.org/plosone/article?id=10.1371/journal...</a>
I thought IQ was more inherent? Why would missing a year of school make you dumber or smarter?<p>My school when I was growing up tracked you based on an IQ test at age 4. How does that type of test vary as you age?