Published October 12, 2017 at 685 × 303 in Kurtosis, Fat Tails, and Extremes « Previous Next » PLATYKURTIC left; LEPTOKURTIC right This sketch (with text) was published by William Sealy Gosset, the “Student” who invented the Student’s t-test. It was a footnote on page 160 in this paper: Student, 1927. “Errors of Routine Analysis”, Biometrika 19 (1/2), 151-164.