Seasonality

Sep 20, 2021

This is my attempt to bring an open source Seasonality indicator to TradingView.
There are still outstanding issues I couldn't figure out, so I am hoping some more seasoned Pine Script coders can take the lead from here.

What is Seasonality: https://www.investopedia.com/terms/s/seasonality.asp

How to Use

• The indicator plots the avg % change per bar for all complete years, up to 20 years back.
  
• It will only show in the daily resolution.
  
• For charts with more data, you need to scroll back a bit to get the line to display.
  
• Use Offset Adjust in the menu for charts that do not align perfectly to the start of the year.
  
• Use Smoothing in the menu to apply an EMA to the line.
  
• The panel shows YTD % gain, 5-day rolling seasonality, and 20-day rolling seasonality.
  

Known Issues

• Does not work for tickers with over 10,000 bars of data.
  
• Some tickers do not align correctly.
  
• Only works with tickers that have ~252 bars a year.
  

Areas for Improvement

• Figure out a way to use barssince() to get the precise amount of bars for each year. This will make the seasonality calculation and automatic offset more accurate.
  
• Have an option for calendar week, month, and year seasonality.
  

Sep 20, 2021

Release Notes

Cleaned up the script.

Sep 21, 2021

Release Notes

Cleaned up the code some more so it is easier to read.