Median age per grade, not per cent of retardation, is the best single statement of the age-grade situation for most practical purposes¶

Claim · All claims
Evidence · 1 study · theoretical r3 · q1
Currency · newest study 1920 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q1 i? The author argues that median age per grade summarizes the age-grade situation better than percentage of retardation for most practical situations. → Pressey 1920

Evidence¶

Pressey 1920¶

Pressey, S. L. (1920). Two Important Points with Regard to Age-Grade Tables. The Journal of Educational Psychology. https://eric.ed.gov/?q=Two+Important+Points+with+Regard+to+Age-Grade+Tables

q1 · i? · theoretical · r3

This is a methodological argument, not an empirical test. The author contends that summarizing age-grade tables "in terms of percentiles, (particularly median age per grade)" is more convenient and statistically more sound than per cent of retardation.

"For many practical situations, the best single statement of the age-grade situation is in terms, not of per cent of retardation, but of median age per grade."

Discussion¶

Related Claims¶

• Schools retard more children than mentality levels would predict: 36.8% are below normal in school versus 20.1% below normal in mentality — related
• The study's conclusions rest on only sixty-five individually tested unretarded cases, limiting generalization — related
• The scale differentiates pupil material between schools in neighborhoods of different character — related
• The school of highest social status shows a consistently greater rate of increase in median mental age relative to chronological age across grades, yet a smaller retardation percentage (33.5% vs 38.4%) than the lowest-status school — related
• Brighter pupils tend to work below capacity: the authors argue the greatest wastage exists among the brightest children, who may keep up to group averages while working under their ability — related
• Excluding a middle 'normal' school group raises the association between school retardation/advancement and median-mentality to Q = +.85 — related