Peak commute times as a function of commute distance.

<p>The peak times of morning (a, c) and evening (b, d) commutes for Ivory Coast (blue solid line with open circles) and Portugal (red dashed line with closed dots), as a function of commute distance. There are two methods of calculating this peak time: the median time (a, b), and the fitted Gaussian mean time (c, d). Note the stronger distance-dependent behaviors in the morning. The individual’s commute times in the morning and evening are estimated, respectively, by the time of the last call from home in the morning, and by the time of the first call from home in the evening. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0096180#pone.0096180.s003" target="_blank">Fig. S3</a> shows the procedure whereby Gaussian distributions are fitted to the distributions plotted in Fig. 3 in order to produce the peak commute time values. The statistics from the Spearman’s rank correlation tests on these relationships are summarized in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0096180#pone-0096180-t002" target="_blank">Table 2</a>.