More Rough Sets
More Rough Sets. Rough Sets C = {Major, Birth_Place} D = {Grade} UC = {{1, 3}, {2,5}, {4}.{7}, {8}} C({1, 2, 6, 8}) = {6, 8}, ͟ C({4}) = UD = {{1, 2, 6, 8}, {3, 5, 7}} ͟ C({3, 5, 7}) = {7} C k D = |POS C (D)|/|U| + 4/8 = 1/2. Rough Sets – Dispensable and Indispensable Attributes
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