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Eigenvalue
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
1
2
Scree Plot
3
Component Number
Figure 4.1 Scree plot for PCA
Table 4.1 PCA Results
Eigenvalue 1.49 1.20 0.88 0.74 0.69
Proportion 0.30 0.24 0.18 0.15 0.14
Cumulative 0.30 0.54 0.71 0.86 1.00
Variable PC1 PC2 PC3 PC4 PC5
Temp 0.57 0.14 -0.14 -0.79 -0.08
WFP 0.44 0.40 -0.57 0.46 0.34
OC -0.29 0.69 -0.13 0.00 -0.66
pH 0.53 -0.39 0.05 0.37 -0.65
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NO3 0.34 0.44 0.80 0.17 0.16
The PCA (Figure 4.1 and Table 4.1) results indicate that almost 90 percent of the
variation can be explained by four factors. The PCA results also indicate that several
factors may have an equally controlling effect on the results. While it is difficult to say
with certainty which one of the five is the most significant factor, the PCA certainly
supports the necessity of a multivariate analysis.
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4
5