Average True Range is used to determine if a ticker's trading range is widening or narrowing, which is helpful for finding the trend or to use as a stop loss. The idea of this indicator is to compare the ATR of altcoins versus bitcoin, since volatility is low.
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 publication is governed by House rules. You can favorite it to use it on a chart.
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