A recently developed theoretical and computational method by Huang [1998] is especially well suited for analyzing time-series data that represent nonstationary and nonlinear processes. The key part of the method is the local wave ,decomposition method
with which any complicated data set can be decomposed into a finite and often small number of intrinsic mode functions that admit well-behaved Hilbert transforms. With the Hilbert transform, the intrinsic mode functions yield instantaneous frequenci...
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