Dividing the 120 pupils into four class-sections by one test would place 51.6 per cent in the wrong section according to the other test¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1921 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? If the 120 pupils were divided into four class-sections by one test's scores, 51.6 per cent would be in the wrong section according to the other test, and 31.8 per cent would be out of place by at least half the range of a class-section. → Geyer 1921

Evidence¶

Geyer 1921¶

Geyer, D. L. (1921). The Reliability of Rankings by Group Intelligence Tests. The Journal of Educational Psychology. https://www.jstor.org/journal/jeduapsy

q2 · i? · associational · r1

Analysis of the same 120-pupil Otis-versus-Illinois comparison, dividing pupils into four sections of thirty by Otis score. Table I reports 62 pupils displaced one section or more, 13 displaced two sections or more, and 3 displaced three sections.

"51.6 per cent of them would have been in the wrong section according to the other test, and 31.8 per cent of them would have been out of place by an amount equal at least to half the range of such a class-section."

Discussion¶

Related Claims¶

• Rankings of the same 120 junior high pupils by the Otis and Illinois group intelligence tests disagreed by a median of 18 places, with a rank correlation of 0.642 — a broader claim this one bears on
• Thurstone-Brown agreement was closer than Otis-Illinois: median rank changes of 6.7 places (freshmen, r = 0.74) and 10.4 places (sophomores, r = 0.613), with 26 and 32.8 per cent wrongly classed — related