Intermedian grade distances on the scientific-thinking scale are derived from the per cent of each grade's pupils lying between successive grade medians¶

Claim · All claims
Evidence · 1 study · design r2 · q2
Currency · newest study 1919 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? The distance between the medians of grades III and IV was computed as 115.3 pupils, or .318 of the 362 third-grade measures, corresponding to 1.346 P.E., with all intermedian intervals averaged across direct and indirect measures. → Herring 1919

Evidence¶

Herring 1919¶

Herring, J. P. (1919). Derivation of a scale to measure abilities in scientific thinking. The Journal of Educational Psychology. https://psycnet.apa.org/journal/edu

q2 · i? · design · r2

Numerical derivation from the score distributions of the Scientific Method Test (Table II): the third-to-fourth grade median distance is 1.346 P.E. measured on the third-grade distribution, and all interval measures were averaged with equal weights. No effect size is printed.

"115.3 pupils from Mill to MIV, or .318 of the 362 measures in the third grade, or 1.346 P. E."

Discussion¶

Related Claims¶

• The zero point of the scale is located from the zero-scoring pupils, giving a weighted average distance O-MIII of 1.654 P.E. — related
• Problems whose per cents solved do not increase monotonically across grades are eliminated as not measuring grade-to-grade progress — related
• Problem positions are averaged across grades with a weighting scheme that distrusts per cents near 0% and 100% and omits entries 3 P.E. or more from the median — related
• The P.E. (median deviation) serves as an equal-step unit of difficulty, defined as the distance cutting off 25% of measures next the median — related