Commits on Jul 10, 2023

1. [GH-173] Support QQE …

   The Qualitative Quantitative Estimation (QQE) indicator works like a smoother
   version of the popular Relative Strength Index (RSI) indicator. QQE expands
   on RSI by adding two volatility based trailing stop lines. These trailing
   stop lines are composed of a fast and a slow moving Average True Range (ATR).
   These ATR lines are smoothed making this indicator less susceptible to short
   term volatility.
   
   https://www.tradingview.com/script/0vn4HZ7O-Quantitative-Qualitative-Estimation-QQE/
   
   Implementation reference:
   https://github.com/twopirllc/pandas-ta/blob/main/pandas_ta/momentum/qqe.py
   
   Example:
   * `df['qqe']` retrieves the QQE with RSI window 14, MA window 5.
   * `df['qqel']` retrieves the QQE long
   * `df['qqes']` retrieves the QQE short
   * `df['qqe_10,4']` retrieves the QQE with RSI window 10, MA window 4
   * `df['qqel_10,4']` retrieves the QQE long with customized windows.
     Initialized by retrieving `df['qqe_10,4']`
   * `df['qqes_10,4']` retrieves the QQE short with customized windows
     Initialized by retrieving `df['qqe_10,4']`
   
   The period of short, long EMA and signal line can be tuned with
   `set_dft_window('qqe', (rsi, rsi_ma))`.  The default windows are 14 and 5.

   

   jealous committed Jul 10, 2023
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