Fig. 2From: The effect of a strict facial-mask policy on the spread of COVID-19 in Switzerland during the early phase of the pandemicAssumed DAG on the eleven sets of variables. The blue edge represents the direct effect of the strict facial-mask policy \(M_{i,t}\) on the response variable \(Y_{i,t}\). The blue edge in conjunction with the path along the orange edges represents the total effect of the strict facial-mask policy \(M_{i,t}\) on the response variable \(Y_{i,t}\)Back to article page