Table 3. Structural influences on network for Jefferson and Sunshine High, parameters and (95% confidence intervals).1 .
| Jefferson High | Sunshine High | |
| basic rate parameterfriendship2 | 12.87 | 6.77 |
| 1: outdegree (density)3 | −3.56 (−3.64, −3.48) | −5.97 (−6.21, −5.73) |
| 2: reciprocity4 | 2.26 (2.13, 2.39) | 2.48 (2.31, 2.66) |
| 3: transitive triplets5 | 0.48 (0.43, 0.53) | 0.67 (0.59, 0.75) |
| 4: same sex6 | 0.18 (0.10, 0.26) | 0.47 (0.37, 0.57) |
| 5: same grade6 | 0.49 (0.41, 0.57) | 0.51 (0.40, 0.61) |
| 6: same black race6 | 0.83 (0.71, 0.95) | |
| 7: same Hispanic ethnicity6 | 0.91 (0.74, 1.08) | |
| 8: age similarity6 | 0.91 (0.62, 1.20) | 1.18 (0.80, 1.56) |
| 9: income similarity6 | 0.060 (−0.23, 0.35) | 0.56 (0.21, 0.90) |
Parameters are the weights actors place on various network configurations. They are the contributions to the objective function. The 95% confidence intervals quantify the precision of the estimates a score function method.
The basic rate parameter for friendship controls how often actors have the opportunity to change their network (add, keep, or drop a friend). Higher values indicate more network changes.
The outdegree parameter is the weight placed on having a friendship tie with any member of the social network, irrespective of the alter’s characteristics.
The reciprocity parameter is the weight an actor places on reciprocating alters’ friendship nominations.
The transitive triplets parameter is the weight an actor places on naming friends who are also named by the actor’s friend.
Positive values of “same” and “similarity” measures are the effects of homophily on these attributes.