Eliminating both the normal school and normal mentality (I.Q.) groups yields Q = +.97 between school retarded/advanced and mentally backward/bright¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1918 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Using I.Q. diagnostic limits to remove a middle mentality class as well, the four-class association (School Retarded and Mentally Retarded; School Retarded and Mentally Advanced; School Advanced and Mentally Retarded; School Advanced and Mentally Advanced) reaches QV = +.97. → 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

q2 · i? · associational · r1

Numerical reanalysis of the same three-school mental-survey data, with middle I.Q. diagnostic limits (e.g., I.Q. of .89 or below; I.Q. of 1.10 or above at age 7). The authors state this coefficient is not such "as to warrant our using school grade as a prediction of mentality" until middle classes on both sides are eliminated; no standardized effect size is printed.

"This procedure results in a QV--value, when "normal" school and "normal" mentality groups are eliminated, of +.97."

Discussion¶

Related Claims¶

• Four or more grades of school retardation perfectly indicates a mentality not above normal, and more than one grade of advancement perfectly indicates a mentality not below normal (Q = +1.00) — related
• Excluding a middle 'normal' school group raises the association between school retardation/advancement and median-mentality to Q = +.85 — related
• Schools retard more children than mentality levels would predict: 36.8% are below normal in school versus 20.1% below normal in mentality — related
• In Goddard's Vineland examination of 1547 pupils, only about half of mentally over-age and under-age pupils show corresponding advancement or retardation in school grading — related