2.4.1 Causal fidelity
Some paths existing between nodes in the static aggregation do not
follow a chronological order, and therefore such paths do not exist in
the temporal representation. To quantify the quality of a static
aggregation, Lentz et al. (2013) defined so-called causal
fidelity, which measures the proportion of paths in a temporal network
which exist in the static counterpart. For this purpose, accessibility
matrices are constructed for the static and temporal networks
representing the path lengths between each pair of nodes. To calculate
the causal fidelity of the network, it is necessary to calculate thepath density (equation 4), where we defined the density of its
accessibility matrix: