Galton's ogive percentile graph serves as a convenient scale that lets an individual's test score be instantly translated into a rank within the normed group¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1916 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? The ogive percentile graph has an advantage over the surface-of-distribution graph as a convenient scale for comparing additional individual measures with group norms. → Bingham 1916

Evidence¶

Bingham 1916¶

Bingham, W. V. (1916). Some Norms of Dartmouth Freshmen. The Journal of Educational Psychology, VII(3), 129-142. https://www.google.com/search?q=%22Some+Norms+of+Dartmouth+Freshmen%22+Bingham+1916

q2 · i? · associational · r1

Methodological exposition, not a tested comparison: the author's stated rationale for choosing Galton's ogive form. He illustrates with a color-naming score of 22.6 seconds corresponding to "thirty-third from the poorest" rank among a hundred freshmen.

"The "ogive" percentile graph here used, has an advantage over the more common "surface of distribution," in that it serves as a convenient scale, and facilitates comparison of additional individual measures with these measures already made on a large group."

Discussion¶

Related Claims¶

• A problem's diagnostic value as a measure of general ability can be indexed by the slope of its pass-rate ogive at the 50% point — related
• Ability distributions in grade-school children are non-normal, with ability clustering in the extreme ranks rather than the median — related