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Table 1 Plackett & Burman 8 matrix containing coded and real values

From: Linalool, citral, eugenol and thymol: control of planktonic and sessile cells of Shigella flexneri

Test Coded values Real values (v v−1)
X1 X2 X3 X4 Linalool Citral Eugenol Thymol
1 + 1 − 1 − 1 + 1 0.0156 0 0 0.0625
2 + 1 + 1 − 1 − 1 0.0156 0.0625 0 0
3 + 1 + 1 + 1 − 1 0.0156 0.0625 0.0313 0
4 − 1 + 1 + 1 + 1 0 0.0625 0.0313 0.0625
5 + 1 − 1 + 1 + 1 0.0156 0 0.0313 0.0625
6 − 1 + 1 − 1 + 1 0 0.0625 0 0.0625
7 − 1 − 1 + 1 − 1 0 0 0.0313 0
8 − 1 − 1 − 1 − 1 0 0 0 0
9 0 0 0 0 0.0078 0.0313 0.01563 0.0313
10 0 0 0 0 0.0078 0.0313 0.01563 0.0313
11 0 0 0 0 0.0078 0.0313 0.01563 0.0313
  1. x1, x2, x3 e x4—codified values of linalool, citral, eugenol and thymol respectively