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The levels of the independent variables through CCD
| Factors | Variables | Levels | ||||
|---|---|---|---|---|---|---|
| −1.682 | −1 | 0 | 1 | 1.682 | ||
| Soluble starch (g/L) | X 1 | 5.0 | 7.0 | 10.0 | 13.0 | 15.0 |
| Yeast extract (g/L) | X 2 | 1.3 | 2.0 | 3.0 | 4.0 | 4.7 |
| Inorganic salts (g/L) | X 3 | 1.0 | 1.7 | 2.7 | 3.7 | 4.4 |
x i = coded value of the variable X i
x 1 = (soluble starch-10)/3; x 2 = (yeast extract-3)/1; x 3 = (inorganic salts-2.7)/1
