More people need to know this: There is more variance in academic outcomes within classrooms than between schools...pic.twitter.com/hyRu5T9xKZ
@RCAFDM It is a common finding. Most variation is between individuals, not groups. True also for within and between family variance.
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@KirkegaardEmil yep & there are still systematic differences between groups....Thanks. Twitter will use this to make your timeline better. UndoUndo
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@KirkegaardEmil my point is that even the best schools don't produce homogeneous outcomespic.twitter.com/7BPxmuNFii
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@RCAFDM They are talking about the aggregate correlation. It doesn't say anything about variation within income bands. -
@KirkegaardEmil i know, it's technically accurate, but they use that to then say stuff like SAT only measures (income|wealth) -
@RCAFDM Well, the conclusion is clearly wrong. :P Sacket and Kuncel did a pretty good take-down of that idea. -
@KirkegaardEmil yep, but most people aren't going to watch that and sometimes summary stats are useful for getting points across :P -
@RCAFDM Politics always comes down to most people being too stupid. ;)
End of conversation
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@KirkegaardEmil (contrary to the imprecision given by that sort of thing)Thanks. Twitter will use this to make your timeline better. UndoUndo
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