For items aligned to multiple target grades, difficulty estimates from different on-grade calibration samples differ negligibly, at most 0.1 logit on average¶
Claim · All claims
Evidence · 1 study · associationalr2·q2
Currency · newest study 2021 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person · overdue for a recheck since 2024: 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? For the 43 reading and 67 science items aligned to multiple target grades, lower- and upper-grade on-grade difficulty estimates differ negligibly from each other and from original estimates. → Wei He 2021
Evidence¶
Wei He 2021¶
Wei He, NWEA Psychometric Solutions. (2021). An Investigation of Item Parameter Invariance Using Focused Calibration Samples for MAP Growth. NWEA. https://www.nwea.org/research/publication/an-investigation-of-item-parameter-invariance-using-focused-calibration-samples-for-map-growth/
q2 · i? · associational · r2
Study 1 recalibrated 43 reading items (Grades 9–10) and 67 science items (multiple grade spans) with each on-grade sample (Tables 3.4–3.5). The report says "the differences are considered negligible, with 0.1 logit at most," and correlations between the different estimates were high (0.96–1.00).
"while the average lower and upper on-grade item difficulty parameters are slightly different from their original item difficulty parameters for both subjects, the differences are considered negligible, with 0.1 logit at most."
Discussion¶
Related Claims¶
- Average on-grade and all-grade item difficulty estimates differ by less than 0.1 logit for MAP Growth items — related
- At least 90% of reading and science items and about 80% of math items show difficulty differences within 0.3 logits between on-grade and all-grade calibration — related
- Calibration sample size differences did not affect the size of on-grade versus all-grade item difficulty estimate differences — related
- Item difficulty estimates from target-plus-adjacent-grade samples generally differ from original estimates about as much as on-grade estimates do, with mean differences within 0.11 logit — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
map-growth-multi-grade-items-negligible-differences |
title |
For items aligned to multiple target grades, difficulty estimates from different on-grade calibration samples differ negligibly, at most 0.1 logit on average |
description |
For items aligned to multiple target grades, difficulty estimates from different on-grade calibration samples differ negligibly, at most 0.1 logit on average |
status |
review |
evidence_strength |
weak |
newest_evidence |
2021 |
source_checked |
2026-10-20 |
recheck_by |
2024 |
generated |
by process:wiki-ingest on 2026-10-08 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — wei-he-2021 |
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