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Table 1 OA(9,4,3,2) L9 orthogonal array

From: Cognitive radio engine parametric optimization utilizing Taguchi analysis

Test ID A B C D
1 1 1 1 1
2 1 2 2 2
3 1 3 3 3
4 2 1 2 3
5 2 2 3 1
6 2 3 1 2
7 3 1 3 2
8 3 2 1 3
9 3 3 2 1