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Table 2 A discernibility matrix of the rough set theory

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

Subject X1 X2 X3 X4 X5 X6 X7 X8
X1 -a        
X2 a2, a4 -       
X3 a1,a2,a4 - -      
X4 - a1,a2 a1,a2,a4 -     
X5 a1, a4 - - a2 -    
X6 - a1,a2,a4 a1,a2,a4 - a2,a4 -   
X7 - a2,a3,a4 a1,a2,a3 - a1,a2,a3,a4 - -  
X8 a1,a2,a3 - - a1,a2,a3,a4 - a1,a2,a3 a1,a2,a4 -
  1. a-, the two elements belonged to the same class so the set of attributes that discerns the two elements were omitted.
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