Figure 14

Number of collective footprints validation. Standard deviation of the silhouette coefficients for number of clusters k in a growing window with respect to a selected number of clusters: \(k=45\) for UniCoop, \(k=12\) for Ta-Feng and \(k=15\) for T-Mall. On the x axis is reported the size of the window, i.e., the number of silhouette coefficients considered with respect to the selected. On the y axis is reported the standard deviation of the silhouette coefficients in the window centered in the selected k