Source for Exponential Hull Moving Average (EHMA) formula: Raudys, Aistis & Lenčiauskas, Vaidotas & Malčius, Edmundas. (2013). Moving Averages for Financial Data Smoothing. Communications in Computer and Information Science. 403. 34-45. 10.1007/978-3-642-41947-8_4.
The Exponential Hull Moving Average is nearly identical to the Hull MA, but EMA used instead of WMA.