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3.4 Dimensional Reduction 69
distinguishing the following sets of features: (CallO), (CalO], {Fe, BlO), (Prot,
PlO). The previous four cluster solution can also be interpreted in terms of these
sets. For instance the (AA, AD, AE)={butter, fat, oil) cluster is the high calory
food cluster.
Figure 3.16. Scatter plot of the food data in a two-dimensional space obtained by
multidimensional scaling.
Figure 3.17. Icicle plot for the Food data using the reduced two-dimensional
space. Four clusters can be easily identified at a linkage distance of 4.
