Griffiths Dominant Cycle, GriffithsPredictor, GriffithsSpectrum, HighPassFilter, SimpleTwoPolePredictor, and SuperSmoother Indicators as published in the January 2025 Stocks and Commodities article titled “Linear Predictive Filters And Instantaneous Frequency” by John F. Ehlers.
Note, the GriffithsSpectrum and GriffithsDominantCycle may have coding errors causing the behavior to not match the article. This is under review and may be updated.