Beginning Anomaly Detection Using

Figure 1-8.  Spending habits of a person over the course of a month

Chapter 1   What Is anomaly DeteCtIon?

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10

As expected, there are a lot of purchases made on Black Friday, some of them quite 

expensive. However, this spike is expected since it is a common trend for many people. 

Now assume that unfortunately, your person had his/her credit card information stolen, 

and the criminals responsible for it have decided to purchase various items of interest to 

them. Using the same month as in the first example (Figure 

1-8

), Figure 

1-10

 is a possible 

graph showcasing what could happen.