![The Hampel identifier: Robust outlier detection in a time series](https://blogs.sas.com/content/iml/files/2021/06/HampelID2-600x336.png)
It is well known that classical estimates of location and scale (for example, the mean and standard deviation) are influenced by outliers. In the 1960s, '70s, and '80s, researchers such as Tukey, Huber, Hampel, and Rousseeuw advocated analyzing data by using robust statistical estimates such as the median and the