Table 2.

Popular features extracted from mobility data.

feature	short description
length of trips	trips are defined specific to applications, for example, movement between two stay points, or using a single mode of transport, etc.
distance from home	home location is often absent in the data for privacy reasons. It is often inferred using heuristics like the location at night
different places visited	characterized by the count of unique ones or the frequency distribution represented with entropy
radius of gyration	deviation from the centroid of the collection of places visited (S): $(1/|S|)\sum _{l\in S}\Vert l-C{\Vert }_2^2$, where C is the centroid location of S
entropy-based measures	entropy of the distribution of the places visited
POI-based features	variance in the type of POIs, relative frequencies, etc.