The California researchers analyzed the coursetaking and math achievement of more than 22,000 students who started 7th grade between 2001 and 2004 in more than 20 schools in a large, unnamed urban district. They found that, for the nearly 2,400 students who performed in the lowest 10 percent on state math tests at the end of 7th grade, taking algebra in 8th grade had no significant effect on their state math-test performance at the end of 8th grade. And it caused their average GPAs to drop 7 percent, about the difference between a C and a C-minus.
Maybe they all had low value added teachers.
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