We have emphasized in Chapter 2 that outlying observations may occur in a data set due to a variety of causes. There are two quite separate questions which arise and these must be carefully distinguished. One problem is to have some statistical techniques which may indicate outlying observations and so select them for special study. That is the problem which we discuss in the rest of this chapter. The second problem is what to do with these outliers, once they are located, and we make a few remarks on that problem now.
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