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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.