Table 2.
Translation of the coded levels in actual units.
| Independent variables | Coded levels |
||
|---|---|---|---|
| -1 | 0 | +1 | |
| A = Polymer concentration (mg) | 100 | 200 | 300 |
| B= Surface modifier concentration (mg) | 300 | 450 | 600 |
| C= Number of cycles | 6 | 7 | 8 |
Where,
| Coded levels | Indicates |
|---|---|
| -1 | Low level of independent variable |
| 0 | Medium level of independent variable |
| +1 | High level of independent variable |