1 The Story
Reading the RSI like a pro
Andrew Cardwell built a career around one indicator, developing a body of RSI analysis so deep that Bruce Babcock called him "the world's leading authority on the RSI."
Cardwell began trading in 1978 as a commodities broker, then left in 1981 to study technical analysis full-time and build a trading program around the Relative Strength Index. He developed concepts like RSI range rules (bull vs bear ranges), positive/negative reversals, and trend confirmation — moving far past the simplistic overbought/oversold reading. He teaches these through Cardwell RSI EDGE.1
2 The Big Idea
What they gave the markets
The RSI as a trend tool — range rules and reversals, not just 70/30.
Cardwell showed the RSI holds different ranges in up- vs down-trends and that "reversals" in the oscillator can signal continuation — a far richer reading than overbought/oversold.1
3 The Method & Contribution
What he developed
4 See It On This Site
Go deeper
On this site
Our RSI deep dive covers Cardwell-style range rules alongside the standard reading — and the honest evidence.
5 The Work
RSI range rules & reversals
RSI range rules & reversals
Andrew Cardwell · Cardwell RSI EDGE- Extended the RSI into a trend-analysis tool via range rules and reversals.
- Taught widely to brokers, money managers and analysts.
6 Read More
Go deeper
- CONCEPTRSI — the definitive guide.
- TRADERJ. Welles Wilder — who created the RSI.
§ Sources