Division charts and their merging algorithm in Rough Non-deterministic information analysis

We have been proposing a framework Rough Non-deterministic Information Analysis (RNIA), which applies granular computing concepts to tables with incomplete information. We have recently defined an expression named division chart over an equivalence class with respect to descriptors. A division chart takes the similar role of the contingency table. In this paper, we clarify the relation between a division chart and rules, and newly propose a merging algorithm for division chart-based rule generation.