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What about Facebook ads doesn't mean that they're an adequate sample? Is there a confounding factor that you have in mind?
by Medicalidiot 6y ago
What about Facebook ads doesn't mean that they're an adequate sample? Is there a confounding factor that you have in mind?
- mlyle 6y agoMany confounding factors. Socioeconomic factors that can't be fixed with stratified sampling (access to transportation, usage of Facebook, etc.. conversely the willingness of a $10 amazon gift card to motivate people to participate will vary). People who are concerned about possible past exposure to COVID-19 may have a different probability to respond. Of course, the bigger issue is that we can't rule out that the antibody tests have a false positive rate that can explain the whole result. We need serology tests in places with a higher positive rate to know. Basically, 50 positive results out of 3330 is a really small signal. Just a small false positive rate or sampling issue could explain all the positive results.