@RanBalicer Can you not control for this bias using "test-negative design" where you use the people that came out negative in the PCR tests as the control for the people that came out positive?
twitter.com/nataliexdean/s…
Natalie E. Dean, PhD@nataliexdean
How do we measure how well the flu vaccine works every year? We use an observational study called the "test negative design." A few tweets on how it works, and why it will be a big part of ongoing COVID-19 vaccine evaluation. 1/8 Figure source: Fukushima et al. (2017) Vaccine
English
