document: Correlation of intuitionistic fuzzy sets by centroid method In this paper , we propose a method to calculate the correlation coefficient of intuitionistic fuzzy sets by means of `` centroid '' . This value obtained from our formula tell us not only the strength of relationship between the intuitionistic fuzzy sets , but also whether the intuitionistic fuzzy sets are positively or negatively related . This approach looks better than previous methods which only evaluate the strength of the relation . Furthermore , we extend the `` centroid '' method to interval-valued intuitionistic fuzzy sets . The value of the correlation coefficient between interval-valued intuitionistic fuzzy sets lies in the interval -LSB- -1 , 1 -RSB- , as computed from our formula
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