Why we know so little about COVID-19 from testing data - and why some extra easy-to-get data would make a big difference

This blog post provides some context for a short article (with Martin Neil, Scott McLachlan and Magda Osman) that was published in LockdownSkeptics and which has received quite a bit of attention.

The daily monitoring of COVID-19 cases (such as the very crude analysis we have been doing) are intended ultimately to determine what the  'current' population…