Table 1.
Variable | Parameter | Range and level | ||||
---|---|---|---|---|---|---|
-1.682 | -1 | 0 | 1 | 1.682 | ||
X1 | Glycerol (g/L) | 1.0 | 3.0 | 5.0 | 7.0 | 9.0 |
X2 | Soytone (g/L) | 5.0 | 9.0 | 15.0 | 21.0 | 25.0 |
X3 | Minerals (g/L) | 3.0 | 4.2 | 6.2 | 8.2 | 9.4 |
xi = coded value of the variable Xi.
x1 = (Glucose - 5)/2; x2 = (Peptone - 15)/6; x3 = (Minerals - 6.2)/2.