Group tests combined with teachers' estimates correlate .77 with the Stanford Revision, questioning the necessity of individual examination¶
Claim · All claims
Evidence · 1 study · associationalr1·q2·i3large
Currency · newest study 1921 · not yet checked against its sources · not reviewed by a person
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 i3 The correlation of .77 between the Stanford Revision and group tests combined with teachers' estimates (30 cases) raised the question whether individual psychological examination is necessary for classification and promotion, though the authors still regard it as indispensable. → Chassell 1921
Evidence¶
Chassell 1921¶
Chassell, C. F., & Chassell, L. M. (1921). A survey of the three first grades of the Horace Mann School by means of psychological tests and teachers' estimates, and a statistical evaluation of the methods employed. Part II. The Journal of Educational Psychology, 12(5), 243-252. https://doi.org/10.1037/h0068285
q2 · i3 · associational · r1
Correlational analysis in the same survey, based on only 30 cases because prolonged absence of many children limited direct comparison; the printed correlation r = .77 codes as a large effect. The authors emphasize that r = .77 means a reduction in the ratio of variability around the regression line to only .64, and they "should still hesitate to say that it was not an essential instrument".
"The correlation of .77 between these measures, based on only 30 cases, is sufficiently high to raise the question as to whether an individual psychological examination is really necessary for determining classification and promotion."
Discussion¶
Related Claims¶
- Combinations of two measure types correlate very highly with the composite (.96, .91, .98), with little difference between choices — related
- Any single measure type approximates the composite (.89, .87, .85) but has only limited value used alone — related
- Group scales allow examining fifty or a hundred children in an hour, whereas individual Binet testing restricts use to special cases — related
- Group tests correlate much lower with the Stanford Revision (.45 and .53) and only .37 with each other — related
- Teachers' estimates show the highest single-measure correlation with the Stanford Revision (.72, 60 cases) — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
combined-group-tests-estimates-correlate-77-stanford |
title |
Group tests combined with teachers' estimates correlate .77 with the Stanford Revision, questioning the necessity of individual examination |
description |
Group tests combined with teachers' estimates correlate .77 with the Stanford Revision, questioning the necessity of individual examination |
status |
review |
evidence_strength |
weak |
newest_evidence |
1921 |
generated |
by process:wiki-ingest on 2026-10-24 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — chassell-1921 |
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