Table 1 Experimental range and levels of independent variables
Actual factor level at coded factor levels at | ||||||
|---|---|---|---|---|---|---|
Variables with designates | Code | −2 | − 1 | 0 | +1 | + 2 |
Glucose (%) | X1 | 0.5 | 0.75 | 1 | 1.25 | 1.5 |
MSG (%) | X2 | 0.5 | 0.75 | 1 | 1.25 | 1.5 |
Incubation period (h) | X3 | 24 | 36 | 48 | 60 | 72 |