Corrected measures of overlapping show 33 per cent correct classification rather than the 17 per cent previously reported, and 19.5 per cent rather than 33 per cent exceeding or falling short of the adjacent grade's median¶

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

Subclaims¶

q2 i? Applying Kelley's correction to the overlapping reported by F. J. Kelly changes correct classification from the reported 17 per cent to 33 per cent, and the share exceeding or falling short of the adjacent grade's median from 33 per cent to 19.5 per cent. → Truman L. Kelley; Ernest C. Witham 1918

Evidence¶

Truman L. Kelley; Ernest C. Witham 1918¶

Truman L. Kelley; Ernest C. Witham. (1918). Communications and Discussions. The Journal of Educational Psychology. https://en.wikipedia.org/wiki/Journal_of_Educational_Psychology

q2 · i? · theoretical · r?

Kelley's analytical correction applied to previously reported grade-overlapping figures, described in the article's own terms as the overlapping "reported by F.J. Kelly". It shows 33 per cent correct classification rather than 17 per cent, and 19.5 rather than 33 per cent beyond the adjacent grade's median.

"Therefore according to the overlapping reported by F.J. Kelly there is 33 per cent, instead of 17 per cent, of correct classification and, referring to the frequencies given in a normal distribution, 19.5, instead of 33 per cent, exceed or fall short of the median accomplishment of the grade above or below."

Discussion¶

Related Claims¶

• Grades overlap massively in spelling: on average 20.8% of pupils reach or exceed the median of the next grade above — related
• Combining reading, writing and spelling scores still leaves immense grade overlap: on average 33.2% of pupils reach the next grade's range and 35.3% fall below their own grade's range — related