b <- graph_from_literal(X -+ Y, Ur -+ X, Ur -+ Y)
V(b)$leftside <- c(0,0,0)
V(b)$latent <- c(0,0,1)
V(b)$nvals <- c(2,2,2)
V(b)$exposure <- c(1,0,0)
V(b)$outcome <- c(0,1,0)
E(b)$rlconnect <- c(0,0,0)
E(b)$edge.monotone <- c(0,0,0)
plot(b)
Run the code above in your browser using DataLab