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Table 1 An example of application of the rough set theory

From: Data mining of the GAW14 simulated data using rough set theory and tree-based methods

Row data Decision rules
Subject a1 a2 a3 a4 D Subject a1 a2 D
X1 1 2 1 1 1 x1 1 2 1
X2 1 3 1 3 2 x2 *a 3 2
X3 2 3 1 2 2 x3 * 3 2
X4 3 1 1 3 1 x4 * 1 1
X5 3 2 1 3 2 x5 3 2 2
X6 3 1 1 1 1 x6 * 1 1
X7 1 1 2 2 1 x7 * 1 1
X8 2 3 2 1 2 x8 * 3 2
  1. a*, unnecessary attribute.