Table 1.
Coded and actual values for Box–Behnken design (BBD).
| Independent variables | Code symbols | Level |
||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Temperature (°C) | X1 | 30 | 50 | 70 |
| Time (min) | X2 | 25 | 35 | 45 |
| Amplitude (%) | X3 | 30 | 40 | 50 |
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