New and old fit statistics are moderately correlated, with Pearson coefficients mostly between 0.50 and 0.79¶
Claim · All claims
Evidence · 1 study · associationalr2·q2
Currency · newest study 2019 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2022: 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? All but one Pearson correlation between new and old infit/outfit statistics fell between 0.50 and 0.79 (the exception, AllYr Mathematics outfit, was 0.81). → He 2019
Evidence¶
He 2019¶
He, W. (2019). MAP Growth K–2 item fit analysis study. NWEA. https://www.nwea.org/research/publication/map-growth-k-2-item-fit-analysis-study/
q2 · i? · associational · r2
Pearson correlations in Table 2.1 between new and old infit and outfit statistics for both samples; values range from 0.53 (AllYr Reading infit) to 0.81 (AllYr Mathematics outfit), described as "moderately correlated."
"All coefficients but one are between 0.50 and 0.79, suggesting that the new and old fit statistics are moderately correlated."
Discussion¶
Related Claims¶
- Adjusting MAP Growth K–2 item difficulties in the 2020 scale alignment study improved item fit, with the largest gains in outfit statistics for difficult Mathematics items — related
- Item fit findings were the same regardless of whether the AllYr or LatestYr response sample was used — related
- New and old fit statistics are highly correlated after difficulty adjustment, with outfit correlations near 0.99 for Mathematics and infit correlations around 0.7 for Mathematics and mid-to-high 0.8–0.9 for Reading — reports the opposite
- Point measure correlations were unchanged by the difficulty adjustment because the new person ability estimates are linear transformations of the old ones — related
- Mathematics items showed more variation in fit statistics than Reading items, and outfit statistics varied more than infit statistics — related
- Adjusting MAP Growth K–2 item difficulties improved item fit, with old infit and outfit statistics more scattered than new ones in both samples — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
new-old-fit-statistics-moderately-correlated |
title |
New and old fit statistics are moderately correlated, with Pearson coefficients mostly between 0.50 and 0.79 |
description |
New and old fit statistics are moderately correlated, with Pearson coefficients mostly between 0.50 and 0.79 |
status |
review |
evidence_strength |
weak |
newest_evidence |
2019 |
recheck_by |
2022 |
generated |
by process:wiki-ingest on 2026-10-08 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — he-2019 |
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