I'm posting two links on the Elliot Wave Theory, not that I am advocating this model, but rather that I want to make it easy for me to find this information should I want to reference it in the future.
Solving the Probability Problem.
https://www.investopedia.com/university/advancedwave/elliottwave4.asp
Lowell
I removed the Rick Swannell book reference as there is a high probability the software is a fraud. His website is not honest. With more Internet snooping, I concluded the "book" is little more than a marketing scam.
Lowell