The Combined Optimization of Savitzky-Golay Smoothing and Multiplicative Scatter Correction for FT-NIR PLS Models

Table 3

RMSEP of the optimal PLS model, respectively, corresponding to the 9 different SPPs in the latter 3 cases of SG smoothing, MSC + SG and SG + MSC.

Pretreatment method	SG smoothing polynomial pattern (SPP)^a
	20	40	21	31	51	22	42	33	53
SG smoothing	0.5460	0.5844	0.5861	0.4870	0.5159	0.4627	0.4563	0.5654	0.5402
MSC + SG	0.5080	0.5535	0.5785	0.4694	0.4946	0.4436	0.4682	0.5413	0.5147
SG + MSC	0.4534	0.4509	0.4507	0.4448	0.4292	0.4085	0.3982	0.4191	0.4253

^aSPP 20 means a quadratic polynomial with 0th-order derivative; SPP 31 means a cubic polynomial with 1st-order derivative; the rest may be deduced by analogy.