Fig. 4
From: Using earth mover’s distance for viral outbreak investigations
Inference of transmission between hosts A and B. First, mean host Mean(A, B) is introduced. Then EMD is computed between Mean(A, B) and hosts A and B. Finally, EMD(Mean(A, B), A) is compared with EMD(Mean(A, B), B). If EMD(Mean(A, B), A) < EMD(Mean(A, B), B), then transmission direction is predicted as the one that happened from A to B