Table 6 Highest contributing variables to principal components PC1–PC3, based on loading Values.
From: Monitoring the condition of city bus engines by analysing used oil using PCA and K-Means clustering
Principal Component | Variable | Loading value |
|---|---|---|
PC1 | Zn (Zinc) | 0.298 |
P (Phosphorus) | 0.286 | |
S (Sulfur) | 0.274 | |
Soot [%] | 0.261 | |
Phos. Antiwear | 0.251 | |
PC2 | Mn (Manganese) | 0.296 |
Cu (Copper) | 0.287 | |
TAN | 0.224 | |
Ni (Nickel) | 0.222 | |
Fe (Iron) | 0.211 | |
PC3 | Cr (Chromium) | 0.384 |
TAN | 0.297 | |
Nitration | 0.256 | |
Pb (Lead) | 0.255 | |
Ca (Calcium) | 0.225 |
