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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.