Table 2 | Ability of spectral preprocessing methods to remove..

Preprocessing method	Cefuroxime sodium			Cefotaxime sodium			Ceftriaxone sodium
Preprocessing method	Within -class variance （I）	Between -class variance （O）	O/I	Within -class variance （I）	Between -class variance （O）	O/I	Within -class variance（I）	Between -class variance （O）	O/I
VN	0.381	2.700	7.1	0.471	2.700	5.7	0.193	4.596	23.8
FD	0.021	0.325	15.5	0.054	0.228	4.2	0.011	0.228	20.7
FD＋VN	0.668	21.380	32.0	3.457	16.278	4.7	0.214	16.278	76.1
SD	0.002	0.032	16	0.005	0.020	4.0	0.001	0.020	20.0
SD＋VN	0.794	23.753	29.9	4.008	19.254	4.8	0.306	19.254	62.9

Table 2: Ability of spectral preprocessing methods to remove the effect of glass vials on NIR spectra of drug samples.