Figure 3.

Smartphone behavioral dynamics at certain time scales are highly correlated to age

(A) We correlated the probability densities at each two-dimensional smartphone behavioral bin with age and gender as explanatory variables. The t-statistics (red-blue images) for the variable age reveal substantial behavioral differences across time scales for both types of interval distributions (JID based on all smartphone interactions: “Full” and interactions on social apps and browsers: “Social”). The corresponding R² of the full regression model is shown in grayscale images.

(B) Adjusted response plots of the linear relationships from a select two-dimensional bin (selection noted in the inserted R² plots). All statistics were corrected for multiple comparisons using two-dimensional clustering (1000 bootstraps, α = 0.05). ITI, inter-touch interval, k, a given interval, and k+1 the subsequent interval.