Online NIR Analysis and Prediction Model for Synthesis Process of Ethyl 2-Chloropropionate

Table 3

Results of PLSR model with different pretreatment methods.

Pretreatment method	Slope	Offset	RMSE
Untreated	0.9926	0.004884	0.02092	0.9926
First-order derivative	0.9885	0.007584	0.02607	0.9885
Second-order derivative	0.9935	0.004326	0.01969	0.9935
SNV	0.9910	0.005941	0.02308	0.9910
SNV + first-order derivative	0.9890	0.007271	0.02553	0.9890
SNV + second-order derivative	0.9945	0.003657	0.01811	0.9945