Image of the word SQL being held up by a crane
Image of the word SQL being held up by a crane

Background


What is an anomaly? It’s something that deviates from what is standard, normal, or expected. In some cases, you can find anomalies by setting up thresholds or bounds. Or you can use supervised machine learning algorithms to find them. But it will require us to train the algorithm with a dataset containing anomalies. But what if the anomalies are hidden in a time series dataset? You can spot them by plotting a trend. Usually they are out of place in such a plot. For example:

The above picture shows a time series dataset in GumGum. The red point is an…

Ying Liu

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