i'm actually not so sure it does. if elementary school performance had a significant impact, that would imply to me that phds performed better in elementary sch

i'm actually not so sure it does. if elementary school performance had a significant impact, that would imply to me that phds performed better in elementary school than others by a significant margin. i don't know if that's true. another way to put it is that it implies that phds are selected from high performing elementary school students, but i would bet, for some elementary schools, even their highest performing students are much less likely to eventually get a phd than equally performing students at other elementary schools.