Table 1.

Network Effect Values Used in Simulations

Network Effect	Social Selection Level					Description of Effect
	Zero	1x	2x	3x
Outdegree	−2.41	−2.53	−2.73	−3.02		Controls number of friendships formed
Drinking Similarity	0	0.39	0.78	1.17		Tendency to form friendships based on similarity in drinking statuses
Transitivity	0.49	0.49	0.49	0.49		Tendency to form relationships with friends-of-friends
Reciprocity	1.85	1.85	1.85	1.85		Tendency to form friendships with others who extend ties to actor
Three-Cycle	−0.35	−0.35	−0.35	−0.35		Tendency for network closure
Friendship Rate	13.17	13.17	13.17	13.17		Typical number of opportunities to change friendships
	Social Influence Level
Drinking Effect	Zero	1x	2x	3x	4x	Description
Linear Drinking	−0.32	−0.32	−0.32	−0.32	−0.32	Linear distribution of drinking
Quadratic Drinking	0.09	0.09	0.09	0.09	0.09	Quadratic distribution of drinking
Social Influence (average alter)	0	0.19	0.38	0.57	0.76	Tendency to change drinking status toward the average drinking status of friends
Drinking Rate	2.24	2.24	2.24	2.24	2.24	Typical number of opportunities to change drinking status

Note. Values at the “1×” levels are reference values from a meta-analysis provided by Huang et al. (2014). Levels of 2×, 3×, and 4× indicate the degree of increased size of social selection or social influence relative to these reference values. In the present study, all levels of social selection were crossed with all levels of social influence. Outdegrees were adjusted slightly from their original values of −2.66 at each level of social selection to provide approximately 5.17 outgoing ties per actor. Networks first evolved using friendship and drinking rate parameters that were 5 times larger than those shown in the table here to allow adequate evolution after they were initialized using completely random drinking and friendship values (per Snijders, 2010).