Table 2 Network properties of ECPI,...

Table 2

Network properties of ECPI, DPT-wide, and university partners’ ego networks (T1–T3)

	T1	T2	T3
ECPI network
Network size (number of actors)	219	298	590
Number of collaborative ties	256	408	1,358
Average degree (in- or out-degree)	1.17	1.37	2.30
Actor-level reciprocity	0.30	0.29	0.34
Dyad reciprocity	0.18	0.17	0.21
Transitivity	0.34	0.29	0.58
DPT-wide ego network
Network size (number of actors)	209	291	575
Number of collaborative ties	249	408	1,358
Average degree (in- or out-degree)	1.19	1.40	2.36
Actor-level reciprocity	0.31	0.29	0.34
Dyad reciprocity	0.18	0.17	0.21
Transitivity	0.34	0.29	0.58
University partners’ (UP) network profile
Number of UPs (egos)	47	53	61
Engaged UPs (degree centrality >0)	32	46	53
Percentage of engaged UPs among all UPs	68%	87%	85%
Degree centrality of engaged UPs¹	2.35 (3.97)	2.57* (4.07)	5.24*** (7.35)
UPs in brokering role (betweenness centrality >0)	6	10	17
Percentage of UPs in brokering role	13%	19%	28%
University partners’ (UP) ego network
Network size of UP’s 1-step ego neighborhood	78	94	198***
Number of collaborative ties	117	202	951
Average degree (in- or out-degree)	1.50	2.15	4.80
Actor-level reciprocity	0.38	0.44	0.40
Dyad reciprocity	0.23	0.28	0.25
Transitivity	0.52	0.46	0.68
UP’s 1-step ego network reach across ECPI network	36%	32%	34%
UP’s 1-step ego network reach across DPT-wide network	37%	32%	34%
UP’s IQV² in 1-step ego network	0.31 (0.36)	0.26 (0.34)	0.54*** (0.28)
Network size of UP’s 2-step ego neighborhood	119	166	279
UP’s 2-step ego network reach across ECPI network	54%	56%	47%
UP’s 2-step ego network reach across DPT-wide network	57%	57%	49%

	T1	T2	T3
ECPI network
Network size (number of actors)	219	298	590
Number of collaborative ties	256	408	1,358
Average degree (in- or out-degree)	1.17	1.37	2.30
Actor-level reciprocity	0.30	0.29	0.34
Dyad reciprocity	0.18	0.17	0.21
Transitivity	0.34	0.29	0.58
DPT-wide ego network
Network size (number of actors)	209	291	575
Number of collaborative ties	249	408	1,358
Average degree (in- or out-degree)	1.19	1.40	2.36
Actor-level reciprocity	0.31	0.29	0.34
Dyad reciprocity	0.18	0.17	0.21
Transitivity	0.34	0.29	0.58
University partners’ (UP) network profile
Number of UPs (egos)	47	53	61
Engaged UPs (degree centrality >0)	32	46	53
Percentage of engaged UPs among all UPs	68%	87%	85%
Degree centrality of engaged UPs¹	2.35 (3.97)	2.57* (4.07)	5.24*** (7.35)
UPs in brokering role (betweenness centrality >0)	6	10	17
Percentage of UPs in brokering role	13%	19%	28%
University partners’ (UP) ego network
Network size of UP’s 1-step ego neighborhood	78	94	198***
Number of collaborative ties	117	202	951
Average degree (in- or out-degree)	1.50	2.15	4.80
Actor-level reciprocity	0.38	0.44	0.40
Dyad reciprocity	0.23	0.28	0.25
Transitivity	0.52	0.46	0.68
UP’s 1-step ego network reach across ECPI network	36%	32%	34%
UP’s 1-step ego network reach across DPT-wide network	37%	32%	34%
UP’s IQV² in 1-step ego network	0.31 (0.36)	0.26 (0.34)	0.54*** (0.28)
Network size of UP’s 2-step ego neighborhood	119	166	279
UP’s 2-step ego network reach across ECPI network	54%	56%	47%
UP’s 2-step ego network reach across DPT-wide network	57%	57%	49%

Note(s): Values in parentheses represent standard deviations. IQV denotes the Index of Qualitative Variation, which measures the heterogeneity of an individual’s direct connections. ¹Paired sample t-test on degree centrality between T1 and T2 is t = 1.828, p = 0.036; between T2 and T3 is t = 4.761, p < 0.001. ²Paired sample t-test on university partners’ IQV between T1 and T2 is t = 1.828, p = 0.036; between T2 and T3 is t = 4.761, p < 0.001. Ego network reach is measured by the proportion of university partners’ ego network size relative to the ECPI or DPT-wide ego network size

Source(s): Authors’ own creation

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