Cluster Analysis and Multidimensional Scaling

This chapter continues the discussion of data reduction techniques begun in Chapter 9. In Chapter 9 the focus was on reducing the number of variables or columns of the data matrix X. Chapter 10 begins by focusing on the reduction of the number of rows of X. Since the rows of X represent observational units, the approach is to combine the units into groups of relatively homogeneous units called clusters. For this approach to data reduction, the various techniques available are commonly called cluster analysis.

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