Quote Originally Posted by CCFCC3PO View Post
What would they weight the samples on? The key piece of missing data is the number of people who have had covid-19.
If you think there is unknown missing data then what are you blabbing on about ?, If you take a huge sample of people and test them weighting the sample by age, gender, social situation, ethnicity etc etc to match them to the entire area that they represent then find out who has it, who has had it and who has not had it, and you keep on testing over a long period of time then you can build up a picture of where, who, when, trends etc