A trust propagation and collaborative filtering based method for incomplete information in social network group decision making with type-2 linguistic trust

A theoretical framework to deal with incomplete preference information in social network group decision making (SN-GDM) is put forward. Firstly, the concept of the type-2 linguistic trust function is defined to model direct trust relationship of group experts in SN-GDM. It adopts the bilattice structure with of trust/distrust values that are all described by distributed linguistic function. Secondly, the type-2 uninorm trust propagation operator...