. 2021 Oct 21;6(43):28598–28610. doi: 10.1021/acsomega.1c03009

Table 3. Validation of the PCA and OPLS-DA Models^a.

model	component	R²X	R²Y	Q²	difference
PCA	1	0.572		0.388
	2	0.706		0.326
OPLS-DA	1	0.652	0.826	0.943	0.117
	2	0.558	0.799	0.862	0.083

R²X and R²Y refer to the cumulative explained variance and Q² refers to the cumulative explained variance for modeling in cross-validation. There is a difference between R²Y and Q².

Table 3. Validation of the PCA and OPLS-DA Modelsa.

Table 3. Validation of the PCA and OPLS-DA Models^a.