Formation Model

Evolution Model

Estimate

Standard Error

Estimate

Standard Error

Reciprocity

1.66***

0.31

1.42***

0.41

Transitive triplets

1.00***

0.11

1.56***

0.14

Transitive recipr. triplets

−0.26

0.23

0.02

0.23

Indegree popularity

−0.04

0.16

−0.02

0.05

Outdegree popularity

−0.25*

0.12

−0.35***

0.05

Outdegree activity

0.01

0.04

0.01

0.04

Gender (female) alter

−0.14†

0.08

−0.16*

0.08

Gender (female) ego

−0.08

0.09

0.09

0.09

Gender (female) similarity

0.17*

0.07

0.10

0.08

Age alter

0.01

0.01

0.03***

0.01

Age ego

0.01

0.01

0.05***

0.01

Age similarity

1.52***

0.40

1.95***

0.34

Initial contact frequency

0.03**

0.01

0.01†

0.01

Initial contact duration (min)

0.01**

0.003

−0.001

0.002