Quote from moonmist:
Smoothed RSI Inverse Fisher Transform was presented by Sylvain Vervoort in the October 2010 issue of Stocks & Commodities magazine. The article was awarded with the Reader's Choice award in 2011.
http://blog.traderslibrary.com/sylv...isher-transform-excerpt-from-sc-magazine.html
This has a set period of 14 days. Following Ehlers work, you should calculate the dominate cycle first, and use that value as the period input. See "Cybernetic Analysis for Stocks and Futures," ch. 10.