Monthly beta (5Y monthly) with multi-timeframe support

The PROPER way to calculate beta for a stock using monthly price returns. None of this nonsense using daily returns and sliding windows as done by other scripts...

Works on any timeframe.

This script has been checked against 100s of stocks on Yahoo finance and Zacks research data and matches 100% (some rounding error as this script is kept updated live on unconfirmed monthly bars).

You can check for yourself:
Zacks fundamentals - beta

The script calculates beta using the Variance-Covariance Method as described on Investopedia
How to calculate Beta