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Some screenshots from a canadian website:

enter image description here enter image description here

See this sinusoidal shape? Why is it there? Shouldn't it be a single curve?

My main guess is when cases are counted: is it possible that they are counted something like every monday or so? I can't believe the virus progression really has sinusoidal-shaped curve.

It is not an error in the website, since other sources seem to show the same thing: worldometers, nbc news, and many others

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  • $\begingroup$ I think you mean SINE, not SINUS. They're different words, with different origins. en.wiktionary.org/wiki/sine#Etymology vs en.wiktionary.org/wiki/sinus#Etymology $\endgroup$ – jamesqf Sep 16 at 5:04
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    $\begingroup$ @jamesqf The page you liked says that sine is a "Doublet of sinus". Hence, they have the same origin. And since the OP has a non-English name, they probably speak on of the many languages where the function is indeed still called "sinus". For example, en.wiktionary.org/wiki/sinus#Noun_7 $\endgroup$ – Vladimir F Sep 16 at 11:23
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    $\begingroup$ I did mean sine, thanks for the info. The sine function is labeled "sinus" in french. $\endgroup$ – Marche Remi Sep 16 at 16:06
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It's a weekly cycle due to reporting disruptions over the weekend.

Use a 7-day moving average to get a better picture. Holidays and such can still be disruptive but the 7-day average solves most of it.

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