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Experimental range of coded and actual values for central composite rotatable design (CCRD)
| Independent variables (xj) | Symbols | Factor levels | ||
|---|---|---|---|---|
| − 1 | 0 | 1 | ||
| Zein (g) | X 1 | 0.3 | 0.1 | 0.5 |
| Acrylic acid (g) | X 2 | 28 | 18 | 38 |
| N,N-methylenebisacrylamide (g) | X 3 | 0.18 | 0.05 | 0.3 |
