[No place, no printer], 1927. 8vo. Without wrappers (as issued). Offprint from: "Journal of the American Statistical Association", September, 1927. Fine and clean. Pp. 283-314.
Scarce offprint of Hotelling's paper on differential equations in statistics.
"Harold Hotelling, a creative thinker in both mathematical statistics and economics. [...] His influence on the development of economic theory was deep though it occupied a relatively small part of a highly productive scientific life devoted primarily to mathematical statistics; only ten of some 87 published papers were devoted to economics, but of these sic are landmarks which continue to this to lead to further developments" (New Palgrave).