Exactly-- and they aren't (well, except in the lottery magnet case) looking at students who probably have an unquestionable, clear-cut NEED for differentiated education to begin with.
89th percentile versus 91st... er...
not the same thing as 99th.
Looking at a group of kids in the 99th percentile that do (or do not) have access to appropriate education would be the really interesting study, but, as puffin notes, the endpoints that one would be looking for there look quite different, as well.
It's not about grade-level test scores.
Not for this cohort, I mean.
