Table 4.
Degree centrality after earthquake.
| Dependent variable = ego’s centrality | Coef. | Cluster SE | t | p > |t| |
|---|---|---|---|---|
| Ego and family all embedded | NA | NA | NA | NA |
| Earthquake dummy (1 = post-quake) | 0.045 | 0.022 | 2.03 | 0.043* |
| Ego and family all embeddedX earthquake dummy | 0.299 | 0.052 | 5.73 | <0.001*** |
| ln(Total call frequency of ego) | 1.565 | 0.036 | 43.76 | <0.001*** |
| ln(Total text frequency of ego) | 0.407 | 0.040 | 10.22 | <0.001*** |
| ln(Internet usage frequency of ego) | −0.008 | 0.007 | −1.12 | 0.263 |
| ln(Phone retail price in Yuan) | 0.345 | 0.050 | 6.93 | <0.001*** |
| ln(Total WeChat frequency) | 0.100 | 0.032 | 3.11 | 0.002*** |
| ln(Total frequency of other instant messaging) | −0.038 | 0.020 | −1.87 | 0.061 |
| Roaming dummy (1 = traveling outside of prefecture) | −0.645 | 0.084 | −7.67 | <0.001*** |
| Rural dummy (1 = rural) | −0.014 | 0.184 | −0.07 | 0.941 |
| Damage dummy (1 = cell towers damaged in neighborhood) | −0.309 | 0.665 | −0.47 | 0.642 |
| Prior intra-family outbound call share share | −4.346 | 0.211 | −20.61 | <0.001*** |
| Family fixed effects | Yes |
Notes: number of obs. = 49,851; time periods = 5; the p values are obtained from a two-sided t test; model controls for fixed effects of families; SE’s clustered at family levels; first variable is perfectly collinear with family fixed effects, and thus was excluded from model estimation.
Model 4 tested if families with fully embedded structures called more people after the earthquake (degree centrality): the significant positive interaction between earthquake intensity and fully embedded family structure shows that at higher earthquake intensity, fully embedded families had greater degree centrality.
***p < 0.001, **p < 0.01, *p < 0.05.