==Introduction to empirical mode decomposition (EMD)==
[[File:Flow chart of EMD algorithm.jpg|thumb|400x400px|Flow chart of basic EMD algorithm<ref>{{Cite webjournal|url=http://www.ripublication.com/irph/ijeee_spl/ijeeev7n8_14.pdf|titleauthor=Sonam Maheshwari, |author2=Ankur Kumar,"|title=Empirical Mode Decomposition: Theory & Applications", |journal=International Journal of Electronic and Electrical Engineering. ISSN |issn=0974-2174 Volume |volume=7, Number |issue=8 (|year=2014), pp. |pages=873-878|last=|first=|date=|website=|publisher=|access-date=}}</ref>{{predatory}}]]
The "empirical mode decomposition" method can extract global structure and deal with fractal-like signals.