. 2020 Apr 22;48(4):0300060519897215. doi: 10.1177/0300060519897215

Table 2.

Model parameters for PCA, PLS-DA, and OPLS-DA.

Models	Model parameter	Cancer-Control		Lump-Control		Cancer-Lump
Models	Model parameter	Positive ions	Negative ion	Positive ions	Negative ion	Positive ions	Negative ion
PCA	R_X² (cum)	0.693	0.552	0.676	0.57	0.601	0.625
PLS-DA	R_Y² (cum)	0.983	0.991	0.973	0.997	0.682	0.888
PLS-DA	Q² (cum)	0.839	0.892	0.892	0.878	0.0307	0.00537
OPLS-DA	R _Y² (cum)	0.998	0.999	0.992	1	0.682	0.991
OPLS-DA	Q² (cum)	0.876	0.783	0.892	0.848	−0.00178	0.359

PCA, principle component analysis; PLS-DA, partial least squares discriminant analysis; OPLS-DA, orthogonal partial least squares discriminant analysis.