Table 2: Calibration and cross-validation result using iPLS regression.
Subintervals | Wavelength range (nm) | Correlation coefficient (r) | RMSEC (hours) | RMSECV (hours) |
1 | 501-510 | 0.2 | 5.61 | 5.8 |
2 | 511-520 | 0.2 | 5.62 | 5.8 |
3 | 521-530 | 0.47 | 5.06 | 5.74 |
4 | 531-540 | 0.2 | 5.62 | 5.81 |
5 | 541-550 | 0.42 | 5.19 | 5.46 |
6 | 551-560 | 0.37 | 5.33 | 5.58 |
7 | 561-570 | 0.38 | 5.31 | 5.54 |
8 | 571-580 | 0.35 | 5.37 | 5.62 |
9 | 581-590 | 0.05 | 5.73 | 6.02 |
10 | 591-600 | 0.45 | 5.11 | 5.56 |
11 | 601-610 | 0.37 | 5.34 | 5.64 |
12 | 611-620 | 0.44 | 5.15 | 5.5 |
13 | 621-630 | 0.39 | 5.27 | 5.53 |
14 | 631-640 | 0.53 | 4.86 | 5.12 |
15 | 641-650 | 0.46 | 5.1 | 5.51 |
16 | 651-660 | 0.07 | 5.72 | 5.91 |
17 | 661-670 | 0.09 | 5.71 | 5.9 |
18 | 671-680 | 0.34 | 5.39 | 5.45 |
19 | 681-690 | 0.45 | 5.13 | 5.37 |
20 | 691-700 | 0.66 | 4.3 | 5.06 |
21 | 701-710 | 0.6 | 4.58 | 5.22 |
22 | 711-720 | 0.64 | 4.42 | 4.65 |
23 | 721-730 | 0.62 | 4.51 | 4.76 |
24 | 731-740 | 0.61 | 4.55 | 4.86 |
25 | 741-750 | 0.08 | 5.71 | 5.89 |