Table 7

Social network centrality statistics. SD, standard deviation.

Job role	Mean (+SD)
Job role	Degree^{^a}	Betweenness^{^b}	Harmonic closeness^{^c}
Extension professional	10.6 (10.7)	2539 (3491)	0.37 (0.09)
Viticulturist	5.2 (6.4)	644 (982)	0.32 (0.09)
Viticulture consultant	3.6 (6.7)	393 (1225)	0.33 (0.19)
Director	2.7 (3.1)	158 (352)	0.37 (0.23)
Vineyard manager	2.6 (3.6)	215 (535)	0.33 (0.17)
Sales representative	2.3 (3.2)	109 (308)	0.45 (0.26)
University research scientist	2.2 (1.2)	66 (103)	0.29 (0.02)
Pest control advisor	1.9 (1.2)	120 (175)	0.26 (0.05)
Winemaker	1.8 (1.9)	74 (212)	0.30 (0.09)
Executive	1.4 (0.7)	91 (266)	0.34 (0.16)
Owner	1.4 (0.8)	30 (99)	0.30 (0.15)
Viticulture technician	1.2 (0.5)	45 (101)	0.26 (0.03)
Group membership (% of actors)	Mean (+SD)
Group membership (% of actors)	Degree	Betweenness	Harmonic closeness
Multiple groups (6%)	12.7 (7.2)	1502 (1178)	0.39 (0.04)
One group (12%)	5.7 (5.6)	634 (1046)	0.34 (0.13)
Non-member (82%)	1.9 (3.0)	173 (846)	0.32 (0.15)
Permutation test group comparisons
Non-member versus one group	p < 0.01	p = 0.02	p = 0.20
Non-member versus multiple groups	p < 0.01	p < 0.01	p = 0.01
One group versus multiple groups	p < 0.01	p < 0.01	p = 0.06

↵^aCounts the number of connections for each actor and indicates how active they are in the network.
↵^bCounts how often each actor falls on the shortest path between other actors.
↵^cMeasures the path distance from an actor to other reachable actors in the network.