Chemometrics-Enabled Raman Spectrometric Qualitative Determination and Assessment of Biochemical Alterations during Early Prostate Cancer Proliferation in Model Tissue

Table 3

Categorization of principal components (PCs) based on their cumulative percentage of total variation and the variance sizes: low-, intermediate-, and high-order PCs.

Spectral dataset	Low-order PCs (<99% of the cumulative variance and >1.0 average eigenvalue)	Intermediate-order PCs (between 99% and 99.5% of the cumulative variance)	High-order PCs (>99.5% of the cumulative variance and <1.0 average eigenvalue)
Stage 1	1	2–16	17–154
Stage 2	1	2–22	23–160
Stage 3	1	2	3–198