This script gives you the ratio between the Nasdaq 100 and the Dow 30 (nas100/dow30). The RSI helps you understand when one of the two indices is overbought or oversold compared to the other one. This indicator is supposed to be of help for the strategy called spread trading, which consists in shorting an asset and buying the other one.
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.
Disclaimer
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