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Because our analysis shows that session lengths are longer than 3 hours in only
about one-fifth of cases, we suspected that there may be a correlation between
session length and laptop battery lifetime. Figure 2 shows this assumption to
be false. It plots the CDF of the percentage of nodes online at each 10-minute
time sample. Recall that not all of the participants started recording data on
the same day. The percentage of Wide area network configuration online is the number of nodes online at a
given time divided by the total number of nodes who have reported data prior
to that time. As expected, for a given percentage of nodes (x), the CDF shows
that there is a higher probability that x or fewer nodes will be on and plugged
in than simply on.
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