Fig. 1From: covidscreen: a web app and R Package for assessing asymptomatic COVID-19 testing strategiesDirected acyclic graph of dependencies in the proposed model. Arrows indicate the direction of causal influences. Note that infection (I) can only cause testing (T) through the presence of symptoms (S), and symptoms can only cause detection through testing. Also, note that vaccination (V) is independent of all other variablesBack to article page