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¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 2010 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

q3 i? Below-norm students improved test scores by an additional 0.32 points post-policy, totaling 0.88 points higher than similar low-ability students pre-policy. → Takako Nomi 2010

Evidence¶

Takako Nomi 2010¶

Takako Nomi, Elaine M. Allensworth. (2010). The Effects of Tracking with Supports on Instructional Climate and Student Outcomes in High School Algebra. Consortium on Chicago School Research, University of Chicago. https://consortium.uchicago.edu/publications/effects-tracking-supports-instructional-climate-and-student-outcomes-high-school

q3 · i? · causal · r2

Model 1 of the sequential test-score regressions on the two-cohort discontinuity sample. Because peers with absenteeism and disciplinary problems have negative relationships with test scores, below-norm scores improved more than expected given their worse classroom climate. Post-policy, the estimated relationship between classroom average ability and below-norm students' algebra scores was -0.28 and not significantly different from zero (p > 0.1) after controlling for other classroom variables: no detected association, which does not show that none exists.

"Above-norm students had higher algebra scores by .56 points post-policy compared to similar pre-policy students. Below-norm students improved their test scores by additional 0.32 points post-policy, totaling 0.88 points higher than similar low-ability students pre-policy."

Discussion¶

Learner Variables¶

• General Cognitive Ability — moderator: an instructional effect differs with it
• Algebraic Thinking — moderator: an instructional effect differs with it

Related Claims¶

• Between- or within-class homogeneous ability grouping has a small negative effect on low-ability primary students but no effect on other students — the general claim this finding bears on, with the studies behind it
• Below-norm students' algebra test scores improved despite having lower-skill peers post-policy, consistent with additional supports offsetting compositional decline — 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
• Pre-policy, classroom average ability related positively to test scores but positively to failure, with effects strongest for high-ability students — 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
• Below-norm students' pass rates improved post-policy because their skills relative to classroom peers improved under sorting — related