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Independent variables of the experimental design.
| Independent Variables |
Units | Variable Type | Coded Factors | Levels | |
|---|---|---|---|---|---|
| Low | High | ||||
| Solid lipid concn. | (% w/v) | Numeric | X1 | 5 | 10 |
| Liquid lipid concn. | (% w/v) | Numeric | X2 | 3 | 6 |
| Surfactant concn. | (% w/v) | Numeric | X3 | 1 | 2 |
| Solid lipid type | Categoric | X4 | Gelucire® 44/14; Softisan® 100 | ||
