Studied from its original page

Regression on grades drawn under two interval assumptions

Pearson and Heron's eye-colour regression diagrams

Made by: Karl Pearson and David Heron
Year: 1913
Field: Statistics
Kind: Data display
Room: How a group spreads

Not shown here: its rights are not cleared

See the original page — Diagram VI, printed p. 239 (leaf n278); Diagram VII on p. 240 (leaf n279, https://archive.org/download/biometrika91913pear/page/n279_w2000.jpg)

Test A passes (published 1913) but test B fails: co-author David Heron died in 1969 (B would run to 2039).

The data it needs

grade_a position · ordinal
grade_b position · ordinal
count value · count · pairs

Built in 5 steps, as its maker described

Diagram VI, printed p. 239 (leaf n278); Diagram VII, printed p. 240 (leaf n279); the comparison and the footnote on p. 241 (leaf n280); Diagram X, printed p. 250 (not opened)

Skeleton drawing, not the original plate

17 other forms share this skeleton

Source

Pearson and Heron 1913, On Theories of Association, Biometrika 9

Attribution less certain: contested, or no single inventor recorded

Searches, not citations

archive.org commons.wikimedia.org scholar.google.com