Group decision-making method based on time-series fuzzy soft sets.

Group decision-making problems based on time-series fuzzy soft set environment have been investigated. For the situation that fuzzy soft sets information's dynamic change as time, the concept of time-series fuzzy soft set is defined, and relative operations and properties have been discussed, too. Considering fuzzy soft sets information of different time has different effect on final decision, the weight determination formulas based on the exponential decay model are given in continuous and discrete time, respectively. Then operations of fuzzy soft sets and the computational formula of the arithmetic weighted average operator have been given with aggregating thought, and the time-series fuzzy soft sets have been aggregated into collective fuzzy soft set. The optimal decision can be obtained by calculating choice value of objects with tools such as the level soft set. Finally, the group decision making approach based on time-series fuzzy soft sets has been proposed and a practical example has been analyzed to verify the reasonability and feasibility of the approach. [ABSTRACT FROM AUTHOR]