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. 2012 Jun 29;7(6):e39795. doi: 10.1371/journal.pone.0039795

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)
1

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.

2

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.

3

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.

4

The reciprocity parameter is the weight an actor places on reciprocating alters’ friendship nominations.

5

The transitive triplets parameter is the weight an actor places on naming friends who are also named by the actor’s friend.

6

Positive values of “same” and “similarity” measures are the effects of homophily on these attributes.