Distributions of normal and feeble-minded groups overlap, with a borderzone between them, per Kohs's examination of 335 inmates¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Kohs's analysis of 335 inmates aged 17-21 found the distributions of the normal and feeble-minded groups overlap, with an upper age limit for feeble-minded of 11.4 and a lower limit for normals of 10.6. → Kohs 1917

Evidence¶

Kohs 1917¶

Kohs, S. C. (1917). An annotated bibliography of recent literature on the Binet-Simon scale (1913-1917). Part II. The Journal of Educational Psychology. https://doi.org/10.1037/h0073125

q2 · i? · associational · r1

Annotation of Kohs (1915/1916, Chicago House of Corr., Psychopathic Dept. Bull. No. 2). The entry continues: "Upper age limit for feeble-minded found to be 11.4, the lower limit for normals found to be 10.6." A related entry (ref. 235) discusses overlapping groups and sets tentative limits for the borderzone.

"An analysis of results obtained from the examination of 335 inmates, ages 17-21. The distributions of the normal and feeble-minded groups overlap."

Discussion¶

Related Claims¶

• Applying the Stanford revision to selected children in four California cities, Williams classified 32% feeble-minded, 20% borderline, 22% dull normal, and 26% normal or superior. — related
• Binet testing of one hundred juvenile court cases classified sixty-six per cent as feeble-minded — related
• In Wallin's St. Louis psycho-educational clinic, of 430 referred cases, 25.9% of 320 boys and 40% of 110 girls were found feeble-minded, with almost twice as many backward and retarded as feeble-minded. — related
• Terman and Knollin indicate the Stanford revision is more accurate than the Vineland revision in estimating dullness, borderlinity and feeble-mindedness. — related
• Woolley found 25.5% of 18-year-old industrial workers feeble-minded on the point scale and advised changing the definition of feeble-mindedness so tested deficiency better matched common-sense opinion. — related
• Application of the Stanford Revision to 1000 non-selected children found the intelligence quotient a valid expression of intelligence, practically no sex differences, and social status not a disturbing influence on mental-age estimates. — related
• Correlation between initial ability and absolute improvement is negative but very small and unreliable in both groups — related
• Feeble-minded intellectual development takes two forms: near-normal development to a limit followed by abrupt cessation, or constant slight retardation with increasing backwardness — related