DEMATEL-ISM model dynamic threshold calculation method based on centrality feature

Abstract

The invention discloses a DEMATEL-ISM model dynamic threshold calculation method based on a centrality characteristic. According to the method, for the subjectivity problem of threshold determination during reachable matrix construction of a traditional DEMATEL-ISM model, factor centrality sorting distribution characteristics are introduced, and a centrality-influence intensity correlation model is established to realize threshold dynamic optimization; the method comprises the following steps: determining an initial threshold through an empirical formula, expanding the range of candidate thresholds, calculating reachable matrixes corresponding to the candidate thresholds and a factor node degree sequence, introducing a Spearman correlation coefficient to quantify the similarity between the node degree sequence and a centrality sequence, and finally screening out an optimal threshold. Compared with the prior art, the method gets rid of the dependence on a single empirical formula, improves the scientificity and objectivity of threshold determination, enhances the robustness of the threshold and the anti-noise capability of the model, effectively retains the interaction relationship among key factors, enables a reachable matrix to be more fit with an actual causal relationship network, and improves the robustness of the threshold. The method is suitable for scenes of complex system factor analysis, risk assessment, hierarchical structure division and the like.