Recipient contact was more frequent in the 30 minutes after 366 missed calls than before them in four weeks of Copenhagen student logs

We tested contact order around 366 missed calls in four weeks of public Copenhagen student phone logs. A recipient call attempt or SMS occurred within 30 minutes after 156 missed calls and before 68. The difference was 24.04 percentage points. A descriptive 95% interval from resampling 179 pairs was 18.67 to 29.61 points. The recipient cluster interval was 18.33 to 30.08 points. Return call attempts increased by 22.13 points. Recipient SMS increased by 4.10 points. These channel counts can overlap. Adding each of 27 whole-day offsets to contact times gave differences from -2.19 to 1.37 points. The three whole-week shifts also gave small differences. Grouping repeated missed attempts left 297 anchors and a difference of 27.27 points. An exploratory check that excluded contacts within 60 seconds left 21.04 points. Zero-duration calls and positive-duration calls had different patterns, but those groups were not assigned at random. The evidence describes contact order in this record. It does not identify a causal reply, a motive, or behavior in other cohorts. Cluster intervals do not preserve all dependence across shared people. The package contains original data, source terms and hashes, an analysis plan, code, event-level flags, all control scores, three figures, and offline reproduction steps. A separate brute-force check passed. A fresh run reproduced all numeric result files exactly.

human communication · missed calls · temporal networks · reciprocity · Copenhagen Networks Study · reproducible analysis