Figure 3
From: Unveiling patterns of international communities in a global city using mobile phone data
Entropy and points of interest. Correlation between average daily activity and entropy and the presence of points of interests in a cell. Points are scatterplot for each cell of the Milan grid (\(r=0.36\), \(p<10^{-4}\)) and are color coded according to the presence of POIs (red) or not (blue). In the background, a color gradient describes the values of a decision function based on a SVM model with RBF kernel (parameters: \(C = 1\) and \(\gamma= 10^{-2}\), estimated via 3-fold cross-validation). Red corresponds to positive decision, i.e. presence of POIs, and blue to negative decision.