A function to create crossvalidation data.
1 2  CreateDataCV(data, p = 0.75, G = 50,
net_type = "directed",deg_thresh = 0, exclude_end = FALSE)

data 
Matrix. A 3column matrix whose each row contains information of one edge in the form (from_node id, to_node id, time_stamp). from_node id is the id of the source node. to_node id is the id of the destination node. time_stamp is the arrival time of the edge. from_node id and to_node id are assumed to be integers starting from 0. time_stamp can be either numeric or string. We assume that a smaller time_stamp represents an earlier arrival time. 
p 
Numeric. Indicates the ratio of number of new edges in the learning data to that of the full data. Default is p = 0.75. 
G 
Integer. Number of bins. Default value is 50. 
net_type 
String. The type of the network: "directed" or "undirected". Default is "directed". 
deg_thresh 
Integer. We only consider nodes with degree at least this threshold. Default value is 0. 
exclude_end 
Logical. If TRUE, then for the testing data, at each timestep we only consider the new edges that connect to nodes with the current degrees less than deg\_max, which is the maximum degree in the learning data. The motivation for this option is that in the learning phase, we can only learn the PA function up to deg_max, so it makes sense to limit the degree in the testing phase to deg\_max. From our experiences, this option does not matter. Default value is FALSE 
.
An object of class "CV_Data" containing the data needed for cross validation.
Thong Pham thongpham@thongpham.net
1. Pham, T., Sheridan, P. & Shimodaira, H. (2016). Nonparametric Estimation of the Preferential Attachment Function in Complex Networks: Evidence of Deviations from Log Linearity, Proceedings of ECCS 2014, 141153 (Springer International Publishing) (http://dx.doi.org/10.1007/9783319292281_13).
2. Pham, T., Sheridan, P. & Shimodaira, H. (2015). PAFit: A Statistical Method for Measuring Preferential Attachment in Temporal Complex Networks. PLoS ONE 10(9): e0137796. doi:10.1371/journal.pone.0137796 (http://dx.doi.org/10.1371/journal.pone.0137796).
3. Pham, T., Sheridan, P. & Shimodaira, H. (2016). Joint Estimation of Preferential Attachment and Node Fitness in Growing Complex Networks. Scientific Reports 6, Article number: 32558. doi:10.1038/srep32558 (www.nature.com/articles/srep32558).
1 2 3  library("PAFit")
data < GenerateNet(N = 100,m = 1,mode = 1, alpha = 1, shape = 5, rate = 5)
data_cv < CreateDataCV(data$graph)

Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.
All documentation is copyright its authors; we didn't write any of that.