Table 3.
Central composite design matrixes with independent variables in coded and actual values, and observed and predicted values of response variable (% demineralization) in the demineralization of wet and dry shrimp byproducts materials. X1, concentration of HCl solution (%, w/v) and X3, solid liquid ratio of HCl solution (w/v)
| Run | Independent variables | Response variable | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| X1 (%, v/v) | X3 (w/v) | Demineralization (%, w/w) | ||||||||
| Wet | Dry | |||||||||
| Ca | Ab | Ac | Ca | Ab | Ac | Observed | Predicted | Observed | Predicted | |
| 1 | −1 | 1 | 1 | −1 | 2 | 2 | 7.9 | −0.8 | 3.5 | 7.9 |
| 2 | −1 | 1 | 1 | +1 | 6 | 7 | 45.9 | 37.6 | 1.3 | −0.5 |
| 3 | +1 | 4 | 5 | −1 | 2 | 2 | 75.3 | 67.1 | 12.9 | 12.9 |
| 4 | +1 | 4 | 5 | +1 | 6 | 7 | 98.4 | 90.5 | 98.5 | 90.1 |
| 5 | −1.41 | 0.38 | 0.17 | 0 | 4 | 5 | 12.8 | 21.3 | 0.0 | −2.5 |
| 6 | +1.41 | 4.62 | 5.82 | 0 | 4 | 5 | 98.8 | 106.7 | 71.8 | 77.1 |
| 7 | 0 | 2.5 | 3 | −1.41 | 1.17 | 1.46 | 2.8 | 11.4 | 3.6 | −1.2 |
| 8 | 0 | 2.5 | 3 | +1.41 | 6.83 | 8.53 | 47.1 | 55.1 | 46.5 | 51.3 |
| 9 | 0 | 2.5 | 3 | 0 | 4 | 5 | 32.1 | 22.4 | 17.0 | 18.4 |
| 10 | 0 | 2.5 | 3 | 0 | 4 | 5 | 16.0 | 22.4 | 15.7 | 18.4 |
| 11 | 0 | 2.5 | 3 | 0 | 4 | 5 | 22.5 | 22.4 | 18.7 | 18.4 |
| 12 | 0 | 2.5 | 3 | 0 | 4 | 5 | 18.9 | 22.4 | 19.4 | 18.4 |
a = coded; b = actual for dry shrimp shell material, c = actual for wet shrimp shell material