Claims

Kornhauser's reported association of Q = +.61 between parental economic standing and children's intelligence depends on excluding the normal group; including normals lowers it to about +.30

Claim · All claims
Evidence · 1 study · associational r1 · q1
Currency · newest study 1918 · 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.

q1 i? Recomputation of Kornhauser's four classes including the normal cases with the advanced cases yields Q = +.30, versus his reported +.61 when normal cases were disregarded. → Toops 1918

Evidence

Toops 1918

Toops, H. A., and Pintker, R. (1918). Mentality and School Progress. The Journal of Educational Psychology. https://eric.ed.gov/?q=Mentality+and+School+Progress+Toops+Pintner

q1 · i? · associational · r1

Re-analysis of a published coefficient from Kornhauser's study of parental economic standing (telephone possession) and children's intelligence, cited as background. The article states "The size of the coefficient is materially affected by leaving out the normal group".

"Had he included all normal cases with the advanced cases, he would haye secured a much lower coefficient, Q = + .30 for the four (now different) classes"

Discussion

Page metadata
Field Value
type claim
id kornhauser-q-sensitive-to-normal-group-exclusion
title Kornhauser's reported association of Q = +.61 between parental economic standing and children's intelligence depends on excluding the normal group; including normals lowers it to about +.30
description Kornhauser's reported association of Q = +.61 between parental economic standing and children's intelligence depends on excluding the normal group; including normals lowers it to about +.30
status review
evidence_strength weak
newest_evidence 1918
generated by process:wiki-ingest on 2026-10-25
trust unverified — no one has confirmed this page's content
sources 1 — toops-1918

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