validation Mix. R% of Nx     R% of Nx degradates    
  CLS PCR PLS CLS PCR PLS
1 100.76 99.23 99.11 101.49 99.07 98.98
2 97.81 99.36 99.26 109.11 96.20 97.88
3 97.39 96.56 98.60 114.36 118.40 104.96
4 96.55 97.88 97.92 112.83 99.63 98.59
5 103.09 99.44 99.52 81.64 100.35 100.35
6 102.90 98.11 98.23 78.46 105.61 104.68
7 100.51 99.65 99.97 87.61 103.01 102.08
8 96.69 101.71 101.66 136.53 91.99 95.19
Mean 99.46 99.00 99.27 102.75 101.78 100.34
RMSEP 0.252 0.234 0.231 0.547 0.208 0.161
Table 4: (Results obtained by applying the proposed chemometric methods to the analysis of the validation set).