These companies can do analysis on this data and even determine types of relationships based on the frequency, duration, and timing of calls (e.g. most people tend to call their mom on Mother's Day).
The timing of calls was varied to maximise the chances of contact: the first two calls were at different times of the working day, with subsequent calls in the evening and then at the weekend.
Anonymized call detail records included the cell tower location (from one of 11,920 routing tower locations), sender, receiver, and timing of calls or SMS communications from 14,816,512 subscribers from June 2008 through June 2009 (with February 2009 missing from the data set).
This issue may be resolved through incorporation of a server/modem combination to handle individual calls, with one system managing all the interfaces to determine the timing of calls.
Using the temporal information encoded in call onsets, we found that the timing of calls was not random but instead occurred in significant vocal interactions between individuals of social groups.
However, the main goal of our study was to get an overview over types and timing of calls, for which the information content of the recordings was easily sufficient.
Bats control many aspects of their echolocation calls such as signal duration, rate and direction of frequency modulation (FM), rate and magnitude of amplitude modulation (AM), signal bandwidth, harmonic structure, and both the number and timing of calls emitted (Gunderson, 1976; Fenton et al., 1987; Fenton et al., 2011).
Backlund et al. have studied the effect of timings of call sequences on those models [175].
In the second ensemble, the time stamps of all calls are randomly reshuffled, which retains the daily and weekly patterns, but removes other temporal correlations between the timings of calls of links.
The timing of the call was curious: About 30 minutes after Weinstein called, Roberti was supposed to join a second emergency board meeting via teleconference.
