PCA
is a very important tool, especially in the preliminary steps of a
multivariate analysis, for performing an exploratory analysis to
obtain an overview of data and find patterns in complex experimental
data. The principal components (PCs) can be presented
graphically as a score plot. The first component of the PCA
explained approximately 29.1% of the variation, and the second
component explained an additional 14.1% of the variation. Although
the two components resolved the measured composition profiles of
samples grown in the Philippines and other regions, the PCA could
not distinguish between rice samples grown in Korea and China.
Thus, PLS-DA was carried out to enhance the poor separation obtained
with the PCA model