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Like the computational process of the correlation coefficient between the real number variables, we first define the deviation of the intuitionistic fuzzy numbers, the variance of the IFS, and the covariance of the IFSs; then propose the formula to get the correlation coefficient between the IFSs. The proposed method not only reflects the symbol attribute of the correlation degree between the IFSs (the value of the correlation coefficient lies in the interval [\u20131, 1]), but also makes sure the integrity of the IFS is maintained. Several examples are given to show the feasibility and advantages of the proposed method. Moreover, we extend this approach to the interval-valued intuitionistic fuzzy set (IVIFS) case.<\/jats:p>","DOI":"10.3233\/ifs-151824","type":"journal-article","created":{"date-parts":[[2016,2,9]],"date-time":"2016-02-09T10:57:49Z","timestamp":1455015469000},"page":"1019-1028","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":39,"title":["A new correlation measure of the intuitionistic fuzzy sets"],"prefix":"10.1177","volume":"30","author":[{"given":"Bingsheng","family":"Liu","sequence":"first","affiliation":[{"name":"College of Management and Economics, Tianjin University, Nan Kai District, Tianjin, P.R. 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