Table 4.
Results of the Longitudinal Exponential Random Graph Models of Friendship at Time 2
| Model 4 | ||||
|---|---|---|---|---|
| School A |
School B |
|||
| Effect | Estimate (standard error) |
Odds ratio | Estimate (standard error) |
Odds ratio |
| Friendship probability (Time 2) | −6.56 (0.11)*** | 0.00 | −8.14 (0.10)*** | 0.00 |
| Friendship skew (Time 2) | −1.50 (0.02)*** | 0.22 | −2.20 (0.02)*** | 0.11 |
| Friendship (Time 1) | 4.75 (0.18)*** | 115.49 | 5.77 (0.13)*** | 321.98 |
| Homophily | ||||
| Gender | −0.03 (0.16) | 0.97 | −0.08 (0.06) | 0.92 |
| Race | 0.95 (0.03)*** | 2.57 | 0.48 (0.03)*** | 1.61 |
| Grade | 0.12 (0.02)*** | 1.13 | 1.88 (0.03)*** | 6.57 |
| SES | 1.51 (0.02)*** | 4.51 | 1.53 (0.03)*** | 4.62 |
| GPA | 0.28 (0.07)*** | 1.32 | −0.12 (0.08) | 0.89 |
| Problem behavior | 2.25 (0.13)*** | 9.50 | 1.04 (0.14)*** | 2.83 |
| Physical health | 0.69 (0.08)*** | 1.99 | −0.04 (0.09) | 0.96 |
| Depression | 0.40 (0.08)*** | 1.49 | −0.36 (0.09)*** | 0.70 |
| Network structure | ||||
| Open triads (Time 2) | −0.28 (0.01)*** | 0.76 | −0.47 (0.01)*** | 0.62 |
| Closed triads (Time 2) | 1.00 (0.03)*** | 2.71 | 0.60 (0.03)*** | 1.82 |
| Transitive potential (Time 1) | 0.63 (0.17)*** | 1.88 | 0.49 (0.04)*** | 1.64 |
| Transitive potential (Time 1) × Friendship (Time 1) |
0.43 (0.06)*** | 1.54 | −0.40 (0.09)*** | 0.67 |
| Activity co-participation | 0.60 (0.14)*** | 1.82 | 1.04 (0.15)*** | 2.84 |
| Activity co-participation × Friendship (Time 1) |
−0.70 (0.05)*** | 0.49 | −0.30 (0.06)*** | 0.74 |
Note.
***
p<.001.