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Table 2 Network Statistics for the Add Health Schools (n = 13) in the Analysis Sample

From: Peer selection and influence effects on adolescent alcohol use: a stochastic actor-based model

  Wave 1(n = 2563) Wave 2 (n = 2299)
Network Structure
Mean number of adolescents per school (range) 197.2 (48-987) 176.8 (41-889)
Mean number of friendship nominations per student 2.04 1.85
Reciprocal friendships (%) 22.9 25.3
Jaccard Indexa, mean (range) .253 (.200-.325)  
Individual Characteristics
Alcohol use, past 12 months
None (%) 49.6 54.0
1-2 times (%) 18.3 14.1
3-12 times (%) 14.2 12.3
More than monthly, less than weekly (%) 8.3 8.7
Weekly or more often (%) 9.6 10.9
  1. aJaccard network stability index = (Number of ties present at both Wave 1 and Wave 2) / (Number of ties present at both Wave 1 and Wave 2 + Number of new ties + Number of dissolved ties).