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Table 7 Principal component loadings

From: Quantitative analysis of some important metals and metalloids in tobacco products by inductively coupled plasma-mass spectrometry (ICP-MS)

Variable PC1 PC2 PC3 PC4
Al 0.959 −0.188 0.011 −0.091
Cr 0.725 −0.272 −0.234 0.509
Mn 0.344 0.828 0.157 0.302
Fe 0.940 −0.216 0.055 −0.035
Co 0.964 0.006 0.024 0.084
Ni 0.846 −0.227 −0.139 0.396
Cu 0.169 −0.172 0.891 −0.061
Zn 0.559 0.577 0.231 −0.006
As 0.889 0.103 −0.018 −0.322
Se 0.381 0.415 −0.409 −0.495
Cd −0.123 0.877 −0.026 0.237
Pb 0.716 0.065 0.053 −0.352
Eigen value 5.896 2.211 1.122 1.056
Variability (%) 49.136 18.422 9.346 8.799
Cumulative Variance (%) 49.136 67.558 76.904 85.704
  1. Values in bold show absolute values greater than 0.50.