Table 1.
Uncoded and coded independent variables used in RSM design
| Symbol | Independent variable | Coded levels | ||||
|---|---|---|---|---|---|---|
| −1.68 | −1 | 0 | 1 | 1.68 | ||
| X 1 | Amplitude (%) | 69.86 | 76 | 85 | 94 | 100.14 |
| X 2 | Time (s) | 89.73 | 102 | 120 | 138 | 150.27 |
| X 3 | Temperature (°C) | 4.82 | 13 | 25 | 37 | 45.18 |
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