By O*net based on survey data of working conditions and sponsored by the U.S. Department of Labor/Employment and Training Administration.
Downloadable from Our World in Data.
“Projecting social contact matrices in 152 countries using contact surveys and demographic data” by Kiesha Prem, Alex R. Cook
The course of the epidemic: can be found here on github.
A critical review here. False positives are a big issue for this type of test.
Oxford’s Blavatnik School of Government is tracking government responses to Covid-19 on a by country basis. The data is downloadable in several formats and there is a working paper describing how it is collected and what it means.
Bendavid et al report the results of a “representative sample” recruited from Facebook of anti-body testing.
Some interesting back of the envelope calculations by Kevin Drum.