Table 3 Central composite design: input variables and their levels
Input variables | Levels | ||||
|---|---|---|---|---|---|
− α | − 1 | 0 | + 1 | + α | |
X1 | |||||
N:C ratio | 0.200 | 0.281 | 0.400 | 0.519 | 0.600 |
X2 | |||||
FeCl3 (g/L) | 0.050 | 0.080 | 0.125 | 0.170 | 0.200 |
X3 | |||||
Olive oil (g/L) | 10.000 | 14.000 | 20.000 | 26.000 | 30.000 |
Input variables | Levels | ||||
|---|---|---|---|---|---|
− α | − 1 | 0 | + 1 | + α | |
X1 | |||||
N:C ratio | 0.200 | 0.281 | 0.400 | 0.519 | 0.600 |
X2 | |||||
FeCl3 (g/L) | 0.050 | 0.080 | 0.125 | 0.170 | 0.200 |
X3 | |||||
Olive oil (g/L) | 10.000 | 14.000 | 20.000 | 26.000 | 30.000 |