STL decomposition : How to do it from Scratch?

Figure out what STL decomposition is and how it works.

This article will help you understand what is STL decomposition and how to do it from scratch. At the end, I will use statsmodel library too, to get the results in seconds.

What is STL decomposition?

So, STL stands for Seasonal and Trend decomposition using Loess. This is a statistical method of decomposing a Time Series data into 3 components containing seasonality, trend and residual.