3 ms·
They said that they collected prior clinical symptoms in the survey, but have not mentioned that they adjusted for those. Given that, I think it's fair to say
by tomerico 7y ago
They said that they collected prior clinical symptoms in the survey, but have not mentioned that they adjusted for those.
Given that, I think it's fair to say that they have not adjusted for the selection bias of people with prior clinical symptoms being more likely to click the ad.