Presentation of the experimental matrix
| No. | Coded values | Real values | ||||
|---|---|---|---|---|---|---|
| X1 | X2 | X3 | Cooking time (X1) | Cooking temperature (X2) | Soaking time (X3) | |
| 1 | –1 | 1 | 1 | 15.00 | 100.00 | 24.00 | 
| 2 | –1.68 (–α) | 0 | 0 | 3.07 | 85.00 | 14.50 | 
| 3 | 0 | 0 | 1.68 (+ α) | 32.50 | 85.00 | 28.77 | 
| 4 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 5 | + 1.68 (+ α) | 0 | 0 | 61.93 | 85.00 | 14.50 | 
| 6 | 1 | 1 | 1 | 50.00 | 100.00 | 24.00 | 
| 7 | –1 | –1 | 1 | 15.00 | 70.00 | 24.00 | 
| 8 | 0 | –1.68 (–α) | 0 | 32.50 | 59.77 | 14.50 | 
| 9 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 10 | –1 | –1 | –1 | 15.00 | 70.00 | 5.00 | 
| 11 | 1 | 1 | –1 | 50.00 | 100.00 | 5.00 | 
| 12 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 13 | 0 | 0 | –1.68 (–α) | 32.50 | 85.00 | 3.26 | 
| 14 | –1 | 1 | –1 | 15.00 | 100.00 | 5.00 | 
| 15 | 1 | –1 | –1 | 50.00 | 70.00 | 5.00 | 
| 16 | 0 | +1.68 (+ α) | 0 | 32.50 | 110.23 | 14.50 | 
| 17 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 18 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 19 | 0 | 0 | 0 | 32.50 | 85.00 | 14.50 | 
| 20 | 1 | –1 | 1 | 50.00 | 70.00 | 24.00 | 
Coded value refers to the value given by the software, which corresponds to the real value that we will use during experimentation in the laboratory