Composition effects on ratings point to evaluator bias rather than genuine changes in teacher effectiveness¶
Claim · All claims
Evidence · 1 study · associationalr2·q2
Currency · newest study 2026 · not yet checked against its sources · not reviewed by a person · recheck by 2029: tool and model accuracy changes quickly
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.
q2 i? Composition effects were not reflected in outcome-based measures of teacher productivity (student growth measures), suggesting evaluator bias. → Delgado 2026
Evidence¶
Delgado 2026¶
Delgado, W., & Sartain, L. (2026). Classroom composition affects teacher performance ratings. Educational Evaluation and Policy Analysis, 48(2). https://consortium.uchicago.edu/publications/classroom-composition-affects-teacher-performance-ratings
q2 · i? · associational · r2
The authors' exploratory mechanism analysis in the Chicago Public Schools data found the rating effects "were not reflected in outcome-based measures of teacher productivity", which they interpret as evidence of evaluator bias.
"Furthermore, our exploration of mechanisms indicated that these effects were not reflected in outcome-based measures of teacher productivity (i.e., student growth measures), pointing to evaluator bias rather than genuine changes in teacher effectiveness as the likely driver."
Discussion¶
Related Claims¶
- Several component measure ratings and the overall rating had low, negative correlations with student socioeconomic disadvantage, suggesting possible bias against principals of more disadvantaged schools — related
- School median student growth percentiles correlate with student disadvantage — reports the opposite
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
evaluator-bias-not-effectiveness-drives-composition-effect |
title |
Composition effects on ratings point to evaluator bias rather than genuine changes in teacher effectiveness |
description |
Composition effects on ratings point to evaluator bias rather than genuine changes in teacher effectiveness |
status |
review |
evidence_strength |
weak |
newest_evidence |
2026 |
recheck_by |
2029 |
generated |
by process:wiki-ingest on 2026-10-08 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — delgado-2026 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.