Figure 5

Sensitivity of class-level bias z-score \(z_{u}^{c_{u}}\). Lower bound cutoff is set as \(b\geq 1\) to which we only take into account venues visited at least once. For each set of venues in individual trajectory cumulatively visited b times or higher, we measure class-level bias z-score \(z_{u}^{c_{u}}\) and take the median values. Upper bound cutoff \(b\geq 20\) is added to accommodate venues visited even more frequently. As b incrementally becomes larger, the medians are largely dropped closer to 0. It indicates that venues visited more frequently tends to be more homogeneous in term of mixing and closer to own socioeconomic status