Proposal of the group decision making method that paid attention to the distance between opinions

Abstract

This paper proposes a new method Distance equality method between opinions in group decision making. We paid our attention to the distance between opinions of evaluators in the group. When the distance between opinions is too bigger than others or too small, it is biased that contribution degree for a group. Therefore the proposal method grades the evaluators to become equal at distance between opinions, and it makes equal the influence on group. Then the method defined VDI that is index for the equality degree on influence on group. If VDI is so small, it means influence on group is equal. As a results of simulation, VDI was corrected to about 0.001 or less. In addition, this method is applicable to the absolute measurement method. And it become a tool that analyze the situation of an individual and the group, because the VDI and grades show the stable value.