Data
This folder contains all the data files for text examples,
 exercises and extra examples. A listing of these files and
 where they are used in the book, and for supplementary examples,
 is given in the files data_list.xls and data_list.pdf. Many of
 the data sets are used for several exercises and for examples.
 Instructors may wish to create their own exercises by combining
 existing exercises that use the same data set. The scope for
 doing so can be explored by consulting one of the data_list files.
