Figure 3.

Dependence of the duration of succeeding call on the gap as a function of ego age. (a) The regression slopes (β) characterizing the strength of the dependence of the duration of the succeeding call on the logarithm of the inter-call gap, plotted as a function of the ego age for the original data and the randomized data. The legends are same as in (b). (b) The regression slopes (${\beta }^{\prime }$) characterizing the strength of the dependence of the duration of the succeeding call on the logarithm of the inter-call gap, when both the duration and the gap are scaled by their respective averages. The error bars span the 95% confidence level.