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Table 3 Results of bibliographic source clustering
Cluster | 1 | 2 | 3 | |
|---|---|---|---|---|
Average silhouette width | 0,517 | 0,512 | 0,530 | |
Cluster size | 176 | 143 | 74 | |
Clustering variables | ||||
 Spatiotemporal model | Top 1 | STARIMA | FFNN | FFNN |
Top 2 | BN | VAR | KNN | |
Top 3 | SVR | TDNN | DL/ARDL | |
Top 4 | VAR | RNN | SVR | |
 Topological structure | Top 1 | Network | Sequential freeway | Sequential arterial |
 Number of links | Median | 26 | 7 | 4 |
 Conventionally referred as |  | Statistical models for a network topology of medium size | ANN for freeways with small number of links | Various models for arterial roads with small number of links |
Target variables | ||||
 Year | Median | 2015 | 2011 | 2014 |
 Spatial FSE | Top 1 | CCF | Up/downstream | Up/downstream |
Top 2 | Upstream | Upstream | All | |
Top 3 | PCA | All | Upstream | |
 Temporal FSE | Top 1 | Predefined | Predefined | Predefined |
Top 2 | CCF | Empirical | Empirical | |
Top 3 | Empirical | CCF | CCF | |