Table 1.
Actual and coded levels of input variables.
| Variables | Symbol | Coded and actual levels |
||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| Time (d) | X1 | 1 | 2.0 | 3 |
| KH2PO4 concentration (g/l) | X2 | 0 | 7.5 | 15 |
| NH4NO3 concentration (g/l) | X3 | 2 | 4.0 | 6 |
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