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Experimental range and levels of the variables (Doehlert matrix)
| Independent variables | Codes | Variables levels | ||||||
|---|---|---|---|---|---|---|---|---|
| NaCl (g/100 g) | −1 | −0.5 | 0 | 0.5 | 1 | |||
| X1 | 0 | 5 | 10 | 15 | 20 | |||
| Citric acid (g/100 g) | −0.866 | −0.577 | −0.288 | 0 | 0.288 | 0.577 | 0.866 | |
| X2 | 0.33 | 1.06 | 1.78 | 2.5 | 3.22 | 3.94 | 4.67 | |
| Marination time (h) | −0.816 | 0 | 0.816 | |||||
| X3 | 4 | 6 | 8 | |||||
