| Factor | Symbol | −1 | 0 | +1 | −2.0 | +2.0 | |
| Temperature (˚C) | X1 | 28 | 35 | 42 | 21 | 49 | |
| Time (days) | X2 | 3 | 5 | 7 | 1 | 9 | |
| pH | X3 | 3.5 | 5.5 | 7.5 | 1.5 | 9.5 | |
| DOSAGE (g/50ml) | X4 | 5 | 8 | 11 | 2 | 14 | |
| No of core points nj | 16 |
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| No of starlike points nα | 8 | ||||||
| No of null points no | 6 | ||||||
| Total no of points n | 30 | ||||||