For conflict problems, attitudes of agents on issues are often lost due to some mistakes, and trisecting a set of agents is an important research topic of conflict analysis, and three-way decisions with rankings and references provides an effective method for trisecting a set of agents. In this paper, we divide a set of issues into two disjoint parts from different perspectives, and give the support and opposition rankings of issues and the support and opposition reference tuples for an incomplete situation table. Then, we design an alliance measure with regard to an issue by a transition prob...