Figure 2
From: Functional clustering of time series gene expression data by Granger causality
(a) The representation of network with four clusters; (b) The network obtained by applying the proposed method with four clusters ( k =4); (c) The representation of the network when the number of clusters is set to five; (d) The network obtained by applying the proposed method with five clusters ( k =5). The solid edges represent Granger causality. Notice that the structure of the “true” network ((a) and (c)) is not observed and it can only be estimated.