# Relative Spread Strength (RSS)

The Relative Spread Strength (RSS) is a modified version of the Relative Strength Index, conceived by Ian Copsey. 

The indicator functions by calculating the variance between the two moving averages. This is done by subtracting the value of the longer-term moving average from the shorter-term moving average.

<figure><img src="https://4186075531-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LD6FsRvQ3jgwJIg6O7r%2Fuploads%2FlEOQKuWCJQKDcshn7iht%2Fimage.png?alt=media&#x26;token=e90506a9-a6ed-402f-9726-235c3c296eb3" alt=""><figcaption><p>Relative Spread Strength (RSS) indicator in Quantower</p></figcaption></figure>