Mental index ratings on the group test showed close correspondence over a two-year interval (r = .72, rank correlation .77) among 46 retested children¶

Claim · All claims
Evidence · 1 study (2 entries) · associational r1–r2 · q2 · i3 large
Currency · newest study 1920 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i3 The correlation between mental indices from 1918 and 1920 testings of the same 46 children was r = .72, with a rank correlation of .77. → Pintner 1920 q2 i? Correlation between crude scores over the two years was lower: Pearson Product Moment 50 and rank correlation 58. → Pintner 1920 (2)

Evidence¶

Pintner 1920¶

Pintner, R., and Marshall, H. (1920). A Combined Mental-Educational Survey. The Journal of Educational Psychology. https://www.google.com/search?q=A+Combined+Mental-Educational+Survey+Pintner+Marshall

q2 · i3 · associational · r1

Reliability study of the mental test: a group of 46 children aged 10 to 14 in 1920 was tested in 1918 and again in 1920, both ratings made under the final standardization. Of the 46, 26 gained (average 6.5 points) and 18 lost (average 5.8 points); the printed r = .72 is a large association.

"The correlation between the mental indices gives a coefficient of r=.72. In other words, the index that a child receives on the mental test is not likely to change much even after the lapse of two years."

Pintner 1920 (2)¶

Pintner, R., and Marshall, H. (1920). A Combined Mental-Educational Survey. The Journal of Educational Psychology. https://www.google.com/search?q=A+Combined+Mental-Educational+Survey+Pintner+Marshall

q2 · i? · associational · r2

The same 46-case retest study found lower correspondence for absolute achievement, attributed by the authors to children of different mental ability progressing at different rates so crude-score increases vary. No standardised effect size beyond the printed coefficients is given.

"The Pearson Product Moment correlation for the crude scores for the 1918 and 1920 testings is 50 and the rank correlation is 58."

Discussion¶

Related Claims¶

• Test-retest correlations of memory span are low, questioning the validity of a single memory span test — related
• Individual children's memory span scores vary considerably between two testings five weeks apart — related
• Against Stanford Binet criteria for 300 grade 3–6 children, the mental index correlated .47, the educational index .52, crude score with mental age .80, mental with educational index .62, and Difference with I.Q. .21 — related
• Between-term score correlations are moderate and lowest for Phonological Awareness — related
• Teachers' estimates show the highest single-measure correlation with the Stanford Revision (.72, 60 cases) — related