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¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 2008 · checked against its sources 2026-10-16 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

Reading the evidence codes

q is the design tier, i the impact, n the sample, and the kind with its r the rigour judged within that kind: what each code means.

This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.

q3 i? Among all but the very lowest-ability below-norm groups, algebra grades increased by .05 to .06 points, while the very lowest-ability students showed declines in algebra grades of .08 points with no significant changes in failure. → Takako Nomi and Elaine M. Allensworth 2008

Evidence¶

Takako Nomi and Elaine M. Allensworth 2008¶

Takako Nomi and Elaine M. Allensworth. (2008). “Double-dose” Algebra as an Alternative Strategy to Remediation: Effects on Students’ Academic Outcomes. Consortium on Chicago School Research, University of Chicago. http://www.informaworld.com/smpp/content~db=all?content=10.1080/19345740802676739

q3 · i? · causal · r2

Percentile-rank-group cohort comparison (equations 3 and 4) contrasting post-policy with pre-policy outcomes for six ability groups; the lowest group's grade decline contrasts with gains of .05 to .06 points for other below-norm groups. No effect size printed.

"However, the very lowest-ability students showed declines in algebra grades (by .08 points—from a coefficient of .14 to .06) and no significant changes in failure."

Discussion¶

Learner Variables¶

Algebraic Thinking — moderator: an instructional effect differs with it

The double-dose algebra policy adversely affected non-targeted above-norm students: their algebra grades declined and failure rates increased 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
Failure rates increased and grades declined for higher-skill students in single-period algebra after the policy — related
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 was least effective for students with the weakest incoming skills, most of whom received special education services — possibly the same claim (merge candidate)
Students with very low initial math abilities benefited less from double-dose algebra than students close to the national median — related
Evidence on the policy's effects on 10th-grade geometry outcomes was inconsistent across groups and years — 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 — a broader claim this one bears on

Page metadata

Field	Value
`type`	`claim`
`id`	`double-dose-effects-vary-by-initial-ability`
`title`	`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`
`description`	`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`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2008`
`source_checked`	`2026-10-16`
`generated`	by `process:wiki-ingest` on `2026-10-08`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `takako-nomi-and-elaine-m-allensworth-2008`

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