Paul Jaccard [SEP] educated at
Paul Jaccard
Paul Jaccard (18 November 1868 in Sainte-Croix – 9 May 1944 in Zurich) was a professor of botany and plant physiology at the ETH Zurich. He studied at the University of Lausanne and ETH Zurich (PhD 1894). He continued studies in Paris with Gaston Bonnier.
He developed the Jaccard index of similarity (he called it "coefficient de communauté") and published it in 1901.
He also introduced the use of the species-to-genus ratio (he called it "
Jaccard index
The Jaccard index, also known as Intersection over Union and the Jaccard similarity coefficient (originally given the French name "coefficient de communauté" by Paul Jaccard), is a statistic used for gauging the similarity and diversity of sample sets. The Jaccard coefficient measures similarity between finite sample sets, and is defined as the size of the intersection divided by the size of the union of the sample sets:
(If "A" and "B" are both empty, we define "J"("A","B")