Table 2 Results of maximum likelihood estimation on ERGM parameters

edges

Messages

 − 6.475*** (0.889)

 − 5.097*** (0.222)

 − 4.229*** (0.110)

nodecov.score

Evaluation score by an instructor

0.056 (0.046)

nodecov.character

Number of characters in messages

 − 0.0001 (0.0001)

nodecov.access

Number of discussion forum access iterations

0.005* (0.003)

nodecov.gratitude

Number of messages with gratitude

0.218*** (0.053)

nodecov.EGRM

Score of questionnaire

0.020 (0.030)

nodecov.link

Number of web links in messages

 − 0.003 (0.031)

nodecov.fig

Number of figures in messages

0.070 (0.063)

nodefactor.gender.female

Female students

 − 0.109 (0.151)

mutual

Reciprocal messages

3.184*** (0.298)

nodematch.country

Same country

0.994*** (0.267)

nodematch.question

Same question number

0.926*** (0.142)

nodematch.gender

Same gender

0.376** (0.170)

absdiff.score

Homophily in evaluation score

 − 0.114** (0.060)

absdiff.character

Homophily in character count

 − 0.0001 (0.0001)

absdiff.link

Homophily in number of web links

0.044 (0.031)

absdiff.fig

Homophily in number of figures

 − 0.088 (0.075)

absdiff.access

Homophily in number of discussion forum access iterations

0.003 (0.003)

absdiff.gratitude

Homophily in number of gratitude messages

0.129** (0.065)

absdiff.EGRM

Homophily in score of questionnaire

 − 0.059 (0.038)

istar(3)

Incoming 3 edges

 − 0.046 (0.072)

gwesp.ISP

Incoming shared partner

 − 0.535 (0.677)

gwesp.ITP

Multiple cyclic closure

0.335* (0.201)