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1
PC2
0.8
Axes of the original
coordinate system
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
PC1
Fig. 9.8
Principal components (PCs) and input data in the base defined by the first two PCs.
Dots
are data points and
lines
are axes of the original coordinate system
100
80
Cumulative
varinace explained
60
40
20
1
1
2
3
Principal components
Fig. 9.9
Heart's electrical activity variance explained by the first three PCs
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