I've been wondering for a while why countries do not test people randomly like in phone surveys, i.e.randomly pick several thousand persons from a region and test them. Like in phone surveys you need to compensate for biases created from people declining to be tested, of course. It would be expensive, but it seems to me that it would yield a good picture of what is going on.
Maybe I'm missing something obvious and this is not possible, though.
Maybe I'm missing something obvious and this is not possible, though.