Figure 8
From: Nonlinear frequency analysis of COVID-19 spread in Tokyo using empirical mode decomposition

Comparison between the weekly denoised trend and decomposed IMF\(_4\). Vertical lines indicate the four waves.
From: Nonlinear frequency analysis of COVID-19 spread in Tokyo using empirical mode decomposition

Comparison between the weekly denoised trend and decomposed IMF\(_4\). Vertical lines indicate the four waves.