{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T00:26:53Z","timestamp":1777854413302,"version":"3.51.4"},"reference-count":18,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2007,4,1]],"date-time":"2007-04-01T00:00:00Z","timestamp":1175385600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Information Science"],"published-print":{"date-parts":[[2007,4]]},"abstract":"<jats:p>In measuring the overlap between two sets A and B (e.g. libraries, databases) one is obliged to calculate the overlap O(A|B) of A with respect to B (i.e. the fraction of elements of B that are also in A) and of O(B|A) of B with respect to A (i.e. the fraction of elements in A that are also in B). Theoretically this requires two samples. In this paper we explain that one sample can suffice to determine confidence intervals for both O(A|B) and O(B|A). The paper closes with the example of measuring the overlap between the secondary sources in mathematics MathSciNet and Zentralblatt MATH and with a remark on the estimation of the Jaccard index.<\/jats:p>","DOI":"10.1177\/0165551506075325","type":"journal-article","created":{"date-parts":[[2007,3,15]],"date-time":"2007-03-15T04:24:27Z","timestamp":1173932667000},"page":"189-195","source":"Crossref","is-referenced-by-count":6,"title":["A note on measuring overlap"],"prefix":"10.1177","volume":"33","author":[{"given":"L.","family":"Egghe","sequence":"first","affiliation":[{"name":"Universiteit Hasselt, Diepenbeek, Belgium Universiteit Antwerpen (UA), Campus Drie Eiken, Wilrijk, Belgium,"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Goovaerts","sequence":"additional","affiliation":[{"name":"Universiteit Hasselt, Diepenbeek, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2007,4,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1108\/eb026563"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1016\/0306-4573(75)90011-4"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1002\/asi.20396"},{"key":"atypb4","volume-title":"Introduction to Informetrics: Quantitative Methods in Library, Documentation and Information Science","author":"L. 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