Table 2.
Central composite rotatable design: coded and actual values of independent variables
| Experimental design points | Rice : black gram Ratio (w/w) | Fermentation time (h) | ||
|---|---|---|---|---|
| Actual | Coded | Actual | Coded | |
| X1 (w : w) | x1 | X2 (h) | X2 | |
| 1 | 3 : 0.72 | −1.000 | 10.58 | −1.000 |
| 2 | 3 : 0.72 | −1.000 | 13.42 | 1.000 |
| 3 | 3 : 1.78 | 1.000 | 10.58 | −1.000 |
| 4 | 3 : 1.78 | 1.000 | 13.42 | 1.000 |
| 5 | 3 : 0.50 | −1.414 | 12.00 | 0.000 |
| 6 | 3 : 2.00 | 1.414 | 12.00 | 0.000 |
| 7 | 3 : 1.25 | 0.000 | 10.00 | −1.414 |
| 8 | 3 : 1.25 | 0.000 | 14.00 | 1.414 |
| 9 | 3 : 1.25 | 0.000 | 12.00 | 0.000 |
| 10a | 3 : 1.25 | 0.000 | 12.00 | 0.000 |
aCentre point repeated 3 times