Table 3 Four-level generalized linear mixed models predicting cooperation in networks with dynamics.

Model 1 is rounds 2 to 12 in the dynamic and mixed networks (because we control for alter’s past cooperative behavior, round 1 is dropped from analyses; n = 21,727 network-participant-round-alters). Model 2 is all rounds in the dynamic and mixed networks following a tie-dropping opportunity (i.e., rounds 4, 7, and 10; n = 4117 network-participant-round-alters). aP < 0.05, bP < 0.01, cP < 0.001. Coefficients for rounds 3 to 12 (model 1) and rounds 7 and 10 (model 2) and sequence in which phases were completed are omitted for brevity.

Model 1Model 2
Dynamic network*−0.21b
(0.08)
0.40
(0.28)
Reputation
information
0.53a
(0.21)
0.53a
(0.21)
Dynamic tie (DT)0.32c
(0.09)
0.70b
(0.24)
Tie-dropping
opportunity,
previous round (T)
0.92c
(0.19)
DT × T0.45b
(0.17)
Was dropped by an
alter, previous
round (A)
1.02a
(0.49)
DT × A−0.50
(0.53)
Second phase†0.49c
(0.08)
0.44
(0.29)
Third phase†0.94c
(0.10)
0.81a
(0.32)
Alter cooperated,
previous round
3.34c
(0.08)
3.44c
(0.25)
Number of ties−0.02
(0.03)
−0.02
(0.08)
Network size0.01
(0.03)
0.01
(0.04)
Proportion of alters
cooperating,
previous round
0.24
(0.16)
2.60c
(0.52)
Constant−1.76b
(0.68)
−2.77b
(0.99)
Variance components
  Round0.62
(0.79)
2.34
(1.53)
  Participant2.18
(1.48)
1.08
(1.04)
  Network0.01
(0.08)
0.00
(0.00)

*Mixed networks are the reference category.

†First phase is the reference category.