Firstly, it calculates hedge ration using OLS linear regression. Then it calculates spread and z-score of spread. if spread in specific range (which it's possible to change in settings) it makes Long/Short orders.
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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