Comment Comment by yapcguy The second link [2] is very interesting - it breaks down some past USA results by ethnicity.It also seems the underlying PISA data is a closely guarded secret. No doubt a political tinderbox.> Why does my second graph have to compare reading scores from 2009 to science scores from 2006 and math scores from 2003? parent yapcguy 13 years ago
It also seems the underlying PISA data is a closely guarded secret. No doubt a political tinderbox.
> Why does my second graph have to compare reading scores from 2009 to science scores from 2006 and math scores from 2003?