How Do We Know if Something Is a Seven?

How do we know when to flag something? As you know, the agrithm now believes there was a change in the data. So that's actually a feature of the particular detection algarithm that we use. Tha algarithm is called a c p m, or change point model and it specifically addresses that issue. And this is one of the reasons why it's particularly a difficult statistical problem. You don't want to cry wolf very many times.