The multivariate normality assumption of the norming model was judged met for all domains and grades, despite some tail deviations in Q-Q plots¶
Claim · All claims
Evidence · 1 study · associationalr2·q2
Currency · newest study 2022 · checked against its sources 2026-10-09 (automated, 1 of 1 entry) · not reviewed by a person · overdue for a recheck since 2025: 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? Graphical checks (histograms, Q-Q plots, CDF curves, and model residuals) indicated some deviations from the straight line at the tails, but the authors concluded the model normality assumption was met for all domains and grades. → Wei He 2022
Evidence¶
Wei He 2022¶
Wei He, NWEA Psychometric Solutions. (2022). Achievement and Growth Norms for English MAP Reading Fluency Foundational Skills. NWEA. https://www.nwea.org/research/publication/achievement-and-growth-norms-for-english-map-reading-fluency-foundational-skills/
q2 · i? · associational · r2
Graphical evaluation of the joint normality assumption using Q-Q plots, CDF curves, and residuals from model estimation, illustrated for Grade K Phonological Awareness scores (Figures 3.1-3.4). The report concludes "the model normality assumption was met for all domains and grades"; no test statistic is printed.
"While the Q-Q plots indicate some deviations from the straight line at the tails, the figures suggest that normality assumptions of the model seem reasonable."
Discussion¶
Related Claims¶
- Q-Q plots, CDF curves, and residual checks support the joint normality assumption underlying the multivariate true score model for the course-specific tests. — related
- The multivariate normality assumption of the true score model was judged reasonable for all domains and grades — possibly the same claim (merge candidate)
- Normality assumptions of the true score model appeared reasonable for the course-specific tests — possibly the same claim (merge candidate)
- The outcome data met t-test assumptions: Lilliefors normality (Lo < Lt for both classes) and variance homogeneity (F count 0.579 < F table 1.84) — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
normality-assumption-met-foundational-skills-norming |
title |
The multivariate normality assumption of the norming model was judged met for all domains and grades, despite some tail deviations in Q-Q plots |
description |
The multivariate normality assumption of the norming model was judged met for all domains and grades, despite some tail deviations in Q-Q plots |
status |
review |
evidence_strength |
weak |
newest_evidence |
2022 |
source_checked |
2026-10-09 |
recheck_by |
2025 |
generated |
by process:wiki-ingest on 2026-10-08 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — wei-he-2022 |
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