Table 4.
Results of variable importance in the projection of aromatic substances in flavored cigarette paper.
| No. | Compounds | Class |
||
|---|---|---|---|---|
| Covariance | Correlation | VIP value | ||
| 1 | 1-Propanol | -0.544 | -0.866 | 6.015 |
| 2 | Nonanal monomer | -0.515 | -0.842 | 5.244 |
| 3 | propylene glycol monomer | -0.324 | -0.840 | 3.631 |
| 4 | 2-heptanone monomer | -0.214 | -0.654 | 2.716 |
| 5 | unknown compound 26 | 0.178 | 0.663 | 2.243 |
| 6 | octaldehyde | 0.188 | 0.668 | 2.152 |
| 7 | butane-2,3-dione | -0.220 | -0.842 | 2.086 |
| 8 | butanal | -0.141 | -0.573 | 2.048 |
| 9 | Butyl acetate | 0.108 | 0.423 | 1.990 |
| 10 | unknown compound 43 | -0.159 | -0.743 | 1.906 |
| 11 | methyl 2-methylbutanoate | 0.187 | 0.776 | 1.763 |
| 12 | acetic acid monomer | 0.216 | 0.559 | 1.754 |
| 13 | unknown compound 31 | -0.117 | -0.520 | 1.708 |
| 14 | Propionaldehyde | 0.211 | 0. 560 | 1.696 |
| 15 | ethanol | -0.136 | -0.675 | 1.696 |
| 16 | unknown compound 17 | -0.151 | -0.531 | 1.667 |
| 17 | unknown compound 15 | -0.127 | -0.559 | 1.659 |
| 18 | unknown compound 10 | -0.143 | -0.644 | 1.646 |
| 19 | 2-Ethyl-1-hexanol monomer | 0.171 | 0.812 | 1.620 |
| 20 | Benzaldehyde | 0.147 | 0.780 | 1.523 |
| 21 | 1-Hexanol | 0.141 | 0.716 | 1.515 |