The 2020 norms report states the MAP Growth scale remains stable while status patterns shifted relative to the 2015 norms¶
Claim · All claims
Evidence · 1 study · associationalr2·q1
Currency · newest study 2020 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2023: 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.
q1 i? The report asserts that the MAP Growth scale remains stable and the measurement model for status and growth is valid and reliable, even though student status patterns differ from the 2015 norms. → Thum 2020
Evidence¶
Thum 2020¶
Thum, Y. M., & Kuhfeld, M. (2020). NWEA 2020 MAP Growth Achievement Status and Growth Norms for Students and Schools. NWEA Research Report. Portland, OR: NWEA. https://www.nwea.org/research/publication/nwea-2020-map-growth-achievement-status-and-growth-norms-for-students-and-schools/
q1 · i? · associational · r2
The report's foreword asserts scale stability and measurement validity across the 2015-to-2020 norming series, noting that "readers may notice differences in student status p atterns from the prior MAP Growth Norms." No empirical test statistics are printed in the available text for this assertion.
"The MAP Growth scale remains stable, t he measurement model for status and growth are valid and reliable, and the series of norming stud ies, while evolving and improving, has a firm foundation from the outset on which we continue to build."
Discussion¶
Related Claims¶
- Both item-level and test-level analyses indicate the MAP Growth measurement scales are remaining stable — possibly the same claim (merge candidate)
- The authors conclude that MAP reading and mathematics CAT constructs are invariant across five time points in ten states (except Indiana mathematics), though their mathematics tables show strong-invariance CFI drops above 0.01 in most states — related
- Post-COVID norm shifts and NWEA's enhanced item selection algorithm change the interpretation of MAP Growth metrics for school accountability — related
- Norm shifts can raise achievement percentiles for schools serving struggling students even when RIT gains and projected proficiency do not improve — related
- Under the 2025 MAP Growth norms, the same reading RIT score can rank higher in achievement percentile due to national declines in achievement — related
- Norm shifts can change teacher evaluation CGP outcomes independently of instructional quality — related
- Under the 2025 norms, higher math growth expectations lower conditional growth percentiles for higher-growth students — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
map-growth-scale-stable-2020-norms |
title |
The 2020 norms report states the MAP Growth scale remains stable while status patterns shifted relative to the 2015 norms |
description |
The 2020 norms report states the MAP Growth scale remains stable while status patterns shifted relative to the 2015 norms |
status |
review |
evidence_strength |
weak |
newest_evidence |
2020 |
recheck_by |
2023 |
generated |
by process:wiki-ingest on 2026-10-08 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — thum-2020 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.