id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-144860-a4i9vnjz	Nason, Guy P.	Rapidly evaluating lockdown strategies using spectral analysis: the cycles behind new daily COVID-19 cases and what happens after lockdown	2020-04-16		.txt	text/plain	3904	204	60	Here we show that transformed new daily COVID-19 cases for many countries generally contain three cycles operating at wavelengths of around 2.7, 4.1 and 6.7 days (weekly). However, we show that there are considerable and useful similarities in the underlying cyclic (spectral) behaviours of the numbers of new daily COVID-19 cases for a range of different countries (see Extended Data figures). Using data [2] from all of the countries we considered, our results show that transformed new daily COVID-19 cases have three underlying cycles: one operating at a wavelength of 2.7 days, a second at 4.1 days and a third at 6.7 days, which we take to be a weekly effect. Given the similarity of the cycles across countries, this indicates that cases could be monitored and pooled across regions, over a short number of days to be fused into longer effective samples using the methods described here.	./cache/cord-144860-a4i9vnjz.txt	./txt/cord-144860-a4i9vnjz.txt