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. 2020 Jun 16;138:110023. doi: 10.1016/j.chaos.2020.110023

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© 2020 Elsevier Ltd. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 2 — Plots of confirmed cases (or new cases) per day, various trends and variabilities. Trend and variability estimations in six time-scales from the COVID-19 data using the FDM with six frequency bands (FBs): (i) Trend ≥ 7 days with FB [0, 1/7], variability with FB (1/7, 0.5], (ii) Trend ≥ 14 days with FB [0, 1/14], variability with FB (1/14, 0.5], (iii) Trend ≥ 21 days with FB (0, 1/21], variability with FB (1/21, 0.5], (iv) Trend ≥ 28 days with FB [0, 1/28], variability with FB (1/28, 0.5], (v) Trend ≥ 35 days with FB [0, 1/35], variability with FB (1/35, 0.5], (vi) Trend ≥ 42 days with FB [0, 1/42], and variability with FB (1/42, 0.5].