SpaghettiScott

Scott’s volatility histogram

ATR shows volatility. SMA of ATR measures the average volatility over a chosen look-back period (default 200).
Divergence of ATR and sma is represented as a histogram.
Low periods of volatility are below the zero line. High periods of volatility are above the zero line.
Average volatility over a 200 period look-back is the zero value.
Open-source script

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.

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