Charter middle school impacts were more positive for more disadvantaged schools and students and more negative for the more advantaged¶

Claim · All claims
Evidence · 1 study · causal r? · q3
Currency · newest study 2015 · checked against its sources 2026-10-20 (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? More positive impacts were found for more disadvantaged schools and students, and more negative impacts for the more advantaged. → Melissa A. Clark 2015

Evidence¶

Melissa A. Clark 2015¶

Melissa A. Clark, Philip M. Gleason, Christina Clark Tuttle, Marsha K. Silverberg. (2015). Do Charter Schools Improve Student Achievement? Educational Evaluation and Policy Analysis, vol. 37, no. 4. https://www.mathematica.org/publications/do-charter-schools-improve-student-achievement doi:10.3102/0162373714558292

q3 · i? · causal · r?

Subgroup pattern reported in the lottery-based study of 33 charter middle schools, comparing admitted and non-admitted applicants' test scores. The study reports "more positive impacts for more disadvantaged schools and students and more negative impacts for the more advantaged"; no subgroup effect sizes are printed.

"with more positive impacts for more disadvantaged schools and students and more negative impacts for the more advantaged"

Discussion¶

Learner Variables¶

Socioeconomic Status — moderator: an instructional effect differs by group

Impacts of charter middle schools on achievement varied considerably across schools and students — related
On average, charter middle schools' impacts on student achievement were negative but not statistically significant — related
KIPP middle schools admit students disadvantaged in ways similar to other local students — related
Oversubscribed charter middle schools differ in features from charter schools that are not oversubscribed — related
On average, lottery-based charter middle schools are neither more nor less successful than traditional public schools in improving student achievement — related
Impacts of charter middle schools on student outcomes varied widely across schools — a broader claim this one bears on
In the earlier National Evaluation of Charter Middle Schools, admission to about 30 charter middle schools produced no significant average effects on achievement, though some schools improved achievement — related

Page metadata

Field	Value
`type`	`claim`
`id`	`charter-impacts-more-positive-for-disadvantaged-students`
`title`	`Charter middle school impacts were more positive for more disadvantaged schools and students and more negative for the more advantaged`
`description`	`Charter middle school impacts were more positive for more disadvantaged schools and students and more negative for the more advantaged`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2015`
`source_checked`	`2026-10-20`
`generated`	by `process:wiki-ingest` on `2026-10-08`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `melissa-a-clark-2015`

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