Fig. 4
From: Text and phone calls: user behaviour and dual-channel communication prediction
Dual-channel prediction mechanism. Note that \(C_1, C_2,\ldots ,C_n\) present the communication events in the training set, whereas, \(C_t, C_{t+1},\ldots ,C_{t_n}\) denotes the events in the test set. The communication events are organised in ascending order of time from left to right, as the most recent data was used in test set to simulate the real world communication environment in the evaluation procedure