Table 1. Statistical results of PLS regression analysis and LODmax.
| Path length (mm) | Aperture | Co-added | r2 | SEN | var(x) | LODmax |
|---|---|---|---|---|---|---|
| 1 | BRM2065 | 32 | 0.99 | 2.7E-06 | 4.6E-07 | 881.4 |
| 2 | BRM2065 | 32 | 0.995 | 5.1E-06 | 1.0E-07 | 224.2 |
| 5 | BRM2065 | 32 | 0.999 | 1.3E-05 | 3.3E-07 | 156.2 |
| 10 | BRM2065 | 32 | 0.97 | 2.5E-05 | 7.0E-05 | 1154.7 |
| 5 | BRM2065 | 32 | 0.999 | 1.3E-05 | 3.3E-07 | 156.2 |
| 5 | NG9 | 32 | 0.998 | 1.3E-05 | 1.1E-06 | 283.6 |
| 5 | NG11 | 32 | 0.9994 | 1.3E-05 | 4.4E-07 | 177.8 |
| 5 | BRM2065 | 8 | 0.999 | 1.3E-05 | 5.6E-07 | 200.1 |
| 5 | BRM2065 | 16 | 0.9996 | 1.2E-05 | 4.0E-07 | 187.6 |
| 5 | BRM2065 | 32 | 0.999 | 1.3E-05 | 3.3E-07 | 156.2 |
| 5 | BRM2065 | 64 | 0.9992 | 1.3E-05 | 5.7E-07 | 205.1 |
| 5 | BRM2065 | 128 | 0.9997 | 1.3E-05 | 2.0E-06 | 379.2 |
r2:determination coefficient, SEN: sensitivity given in PLS by the inverse of the length of the regression coefficients, var(x): variance in instrumental signals.