A concept of similarity for intuitionistic fuzzy sets and its use in group decision making

We apply a new measure of similarity to analyse the extent of agreement in a group of experts. The proposed measure takes into account not only a pure distance between intuitionistic fuzzy preferences but also examines if the compared preferences are more similar or more dissimilar to each other. The agreement of the entire group is assessed via an aggregation of individual testimonies expressed by intuitionistic fuzzy preference relations.