Below-norm students' algebra test scores improved despite having lower-skill peers post-policy, consistent with additional supports offsetting compositional decline¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 2013 · checked against its sources 2026-10-16 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

q3 i? Algebra test scores improved for below-average skills students even though they took algebra with lower achieving peers post-policy; the coefficient rises from .76 to .85 once peer skill levels are controlled. → Takako Nomi and Elaine M. Allensworth 2013

Evidence¶

Takako Nomi and Elaine M. Allensworth 2013¶

Takako Nomi and Elaine M. Allensworth. (2013). Sorting and Supporting: Why Double-Dose Algebra Led to Better Test Scores but More Course Failures. American Educational Research Journal. https://doi.org/10.3102/0002831212469997

q3 · i? · causal · r2

Regression models for below-norm students in the same cohort design. "The coefficient rises from .76 to .85 once peer skill levels are controlled for" — consistent with the hypothesis that additional supports led to higher test scores. Peer skill coefficient for below-norm students is only one third of that for above-norm students (0.30 compared to 1.07).

"In fact, their scores improved more than would be expected, given that they had lower skill peers post-policy than similar students had pre-policy. (The coefficient rises from .76 to .85 once peer skill levels are controlled for)."

Discussion¶

Learner Variables¶

• Algebraic Thinking — outcome: instruction changes it

Related Claims¶

• A practice-framework article, quoting Johnston and Wildy (2016), reports that the literature generally finds attainment grouping (streaming) harms learning outcomes, while noting the research is contested — the general claim this finding bears on, with the studies behind it
• Below-norm students' test scores improved post-policy (0.88 points total), and the relationship between classroom average ability and their scores was no longer statistically significant post-policy — related
• Algebra failure rates rose post-policy for above-norm students (~3 percentage points) but fell for below-norm students (~4 points); classroom environment and peer ability explained most of the above-norm rise but not the below-norm fall — related
• Double-dose algebra policy increased academic demand for both high- and low-skill students, with below-norm students' gains not attributable to peer ability changes — related
• Below-norm students' pass rates improved post-policy because their skills relative to classroom peers improved under sorting — related
• Classroom peer skill levels explain about 20% of post-policy test score improvements among above-norm algebra students in Chicago — related
• Chicago's double-dose algebra policy raised algebra test scores for both low-skill and high-skill students — a broader claim this one bears on
• Double-dose algebra improved algebra test scores for targeted students just below the cutoff, with a larger post-policy gain than for students just above the cutoff — related
• Tracking intensified concentration of behavioral and absentee problems in double-dose algebra classes, explained by declines in peer ability — related
• Double-dose algebra improved test scores but did not reduce algebra failure rates — related
• Policy effects on grades and failure rates differed by incoming ability: most below-norm students' grades improved slightly, but the very lowest-ability students' algebra grades declined — related
• Double-dose algebra substantially increased interactive pedagogy for low-skill students (.55 SD, p<.001), unexplained by classroom compositional changes — related
• Double-dose algebra support courses improved algebra test scores for targeted low-skilled students but only modestly affected grades and failure rates — related
• How students are sorted into classrooms by skill level can affect their achievement as much as the content they are taught — related
• Sorting by ability affects grades and pass rates differently from test scores: high-skilled students' grades and pass rates decline while low-skilled students' grades improve — related
• Interactive pedagogy increased nearly half a standard deviation for below-norm students in homogeneous double-dose algebra classes — related
• Average test scores are higher when classes are sorted by skill, driven by large learning gains for high-skilled students and slightly lower scores for low-skilled students — reports the opposite