Table 3 summarizes meta-analysis results of school-by-school models for first alcohol use. The mean parameter columns contain the estimated mean in the population of schools, whereas the standard deviation columns refer to the standard deviation in this population, corrected for unreliability of the individual observed school means. Network change rates, not shown, were generally between 10 to 20. These rates correspond to the number of tie changes an actor could make from one observation occasion to the next (Snijders et al., 2010). Even so, best friend nominations varied considerably even over these relatively short interwave periods, with Jaccard coefficients (measuring choice stability on a 0–1 scale) in a range of about .20–.30. The unlimited choice network assessment combined with school-wide choice sets probably were responsible. Nevertheless, SABM is generally tractable with such data (Ripley et al., 2012), and in any case, final model quality, measured by convergence and reasonable standard error estimates, is the ultimate criterion.
