Table 1.
Parameters included in the separable temporal exponential random graph models (STERGM)
| Effect (parameter type) | Description |
|---|---|
| Structural effects | |
| Geometrically weighted edge-wise shared partner (gwesp) | Probability that ties are formed or maintained to increase shared partners among connected dyads |
| Geometrically weighted dyad-wise shared partner (gwdsp) | Probability that ties are formed or maintained to increase shared partners among unconnected dyads |
| Geometrically weighted degree (gwdegree) | Dispersion of edges across nodes, following a non-preferential attachment |
| Primary Attribute Effects | |
| Sexual identity, activity (nodefactor) | Effect of sexual identity (gay, straight, bisexual, or something else) on tie formation and maintenance |
| Sexual identity, homophily (nodematch) | Tendency for actors to form or maintain friendships with actors who are of the same sexual identity |
| Gender identity, activity (nodefactor) | Effect of gender identity (transgender female or cisgender male) on tie formation and maintenance |
| Gender identity, homophily (nodematch) | Tendency for actors to form or maintain friendships with actors who are of the same sexual identity |
| Age, activity (nodecov) | Effect of actor age on tie formation and maintenance |
| Age, homophily (absdiff) | Tendency for actors to form or maintain friendships with actors who are of similar age. |
| HIV status, activity (nodefactor) | Effect of HIV status on tie formation and maintenance |
| HIV status, homophily (nodematch) | Tendency for actors living with HIV to form or maintain friendships with other actors also living with HIV |
| Treatment Main and Interaction Effects | |
| Treatment, activity (nodefactor) | Effect of treatment assignment on tie formation and maintenance |
| Sex identity * Treatment, activity (nodefactor) | Effect of treatment assignment on the relationship between sexual identity (gay, straight, bisexual, or something else) and tie formation and maintenance. |
| Gender identity * Treatment, activity (nodefactor) | Effect of treatment assignment on the relationship between transgender identity and tie formation and maintenance. |
| Age * Treatment, activity (nodecov) | Effect of treatment assignment on the relationship between age and tie formation and maintenance. |
| HIV status * Treatment, activity (nodefactor) | Effect of treatment assignment on the relationship between living with HIV and tie formation and maintenance. |
| Control Attribute Effects | |
| Total number of Facebook friends, activity (nodefactor) | Effect of friendship network sizea (small, medium, large) on tie formation and maintenance with study participants |
a
Size of Facebook friendship network includes participant and non-participant Facebook friends