mathematical notation lowercase 'sigma'
mathematical notation lowercase 'sigma' squared
mathematical notation lowercase 'beta'
Yearly = 250 or 365
Quarterly = 50 or 90
Monthly = 20 or 30
Options Contract Expiry = barmerge.lookahead_on
"Merge strategy for the requested data position. Requested barset is merged with current barset in the order of sorting bars by their opening time. This merge strategy can lead to undesirable effect of getting data from "future" on calculation on history. This is unacceptable in backtesting strategies, but can be useful in indicators."
[All other timeframes barmerge.lookahead is disabled.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.