TABLE 3—
Results of the Meta-Analysis of Exponential Random Graph Models: National Longitudinal Study of Adolescent Health, 1994–1996 (n = 88 Schools)
| Model 1, b (SE; 95% CI) | Model 2, b (SE; 95% CI) | Model 3, b (SE; 95% CI) | |
| Edges | −4.66*** (0.11; −4.88, −4.44) | −3.53*** (0.09; −3.71, −3.35) | −5.04*** (0.20; −5.43, −4.65) |
| BMI indegree | −.10*** (0.03; −0.16, −0.04) | −0.16** (0.06; −0.28, −0.04) | −0.14*** (0.02; −0.18, −0.10) |
| BMI outdegree | 0.09*** (0.02; 0.05, 0.13) | 0.08 (0.06; −0.04, 0.20) | 0.16*** (0.02; 0.12, 0.20) |
| BMI homophilya | 0.17*** (0.02; 0.13, 0.21) | 0.11* (0.05; −.01, 0.21) | 0.14*** (0.02; 0.10, 0.18) |
| Dyadic homophily | |||
| Gender (female)b | 0.04** (0.02; 0.00, 0.08) | −0.25*** (0.02; −0.29, −0.21) | |
| Whitea | 0.08** (0.03; 0.02, 0.14) | 0.60*** (0.07; 0.46, 0.74) | |
| Hispanica | 0.60*** (0.07; 0.46, 0.74) | 0.67*** (0.06; 0.55, 0.79) | |
| Asiana | 0.99*** (0.27; 0.46, 1.52) | 1.27*** (0.05; 1.17, 1.37) | |
| Black a | 0.19*** (0.06; 0.07, 0.31) | 1.26*** (0.06; 1.14, 1.38) | |
| Other racea | 0.38*** (0.11; 0.16, 0.60) | 0.45*** (0.03; 0.39, 0.51) | |
| Gradeb | −0.60*** (0.01; −0.62, −0.58) | −1.38*** (0.05; −1.48, −1.28) | |
| GPAb | −0.16*** (0.02; −0.20, −0.12) | −0.21*** (0.01; −0.23, −0.19) | |
| Depressionb | 0.01 (0.02; −0.03, 0.05) | −0.09*** (0.01; −0.11, −0.07) | |
| Sport activitiesb | −0.03*** (0.01; −0.05, −0.01) | −0.11*** (0.01; −0.13, −0.09) | |
| Nonsport activitiesb | 0.00 (0.01; −0.02, 0.02) | −0.11*** (0.01; −0.13, −0.09) | |
| Endogenous network processes | |||
| Reciprocity | 2.83*** (0.09; 2.65, 3.01) | 3.93*** (0.09; 3.75, 4.11) | |
| Indegree (GW) | −0.61*** (0.08; −0.77, −0.45) | ||
| Outdegree (GW) | −1.52*** (0.05; −1.62, −1.42) | ||
| Edgewise shared partners (GW) | 1.63*** (0.00; 1.63, 1.64) | ||
| Dyadwise shared partners (GW) | −0.13*** (0.00; −0.14, −0.12) | ||
| Outgoing ties | |||
| Gender (female) | 0.08*** (0.02; 0.04, 0.12) | ||
| Grade | −0.12*** (0.02; −0.16, −0.08) | ||
| GPA | −0.01 (0.01; −0.03, 0.01) | ||
| Depression | 0.00 (0.01; −0.02, 0.02) | ||
| Sport activities | 0.06*** (0.01; 0.04, 0.08) | ||
| Nonsport activities | 0.08*** (0.01; 0.06, 0.10) | ||
| Incoming ties | |||
| Gender (female) | −0.03 (0.02; −0.07, 0.01) | ||
| Grade | 0.17*** (0.01; 0.15, 0.19) | ||
| GPA | 0.02 (0.01; 0.00, 0.04) | ||
| Depression | 0.14*** (0.02; 0.10, 0.18) | ||
| Sport activities | 0.12*** (0.01; 0.10, 0.14) | ||
| Nonsport activities | 0.09*** (0.01; 0.07, 0.11) |
Note. BMI = body mass index; CI = confidence interval; GPA = grade point average; GW = geometrically weighted.
a
Nodematch effect indicates the likelihood of a tie based on whether dyad members match exactly on the attribute.
b
Absdiff is the absolute difference between dyad members; negative coefficients indicate homophily (greater differences decrease the likelihood of ties).
*P < .05; **P < .01; ***P < .001 (2-tailed tests).