
Nate Silver @NateSilver538
If the Santa Clara study was asking for healthy volunteers and recruiting in wealthy, well-connected neighborhoods, that's definitely going to bias the results, but I'm not sure if it biases them toward overestimation (possibly underestimation instead). https://t.co/QXpat6wUxf https://t.co/qkrH8gMj6v — PolitiTweet.org