[statnet_help] Question about using constraints in ergm

[Jacob Young]

Hi all,

I am estimating a model to assess whether the effect of a variable differs across two networks. Specifically, whether a  nodeifactor() term for a variable “white” (a binary White/Non-white node covariate). Here is a simple model:

ergm(
  mynet
  ~ edges + mutual + nodeifactor( "white" ) # here is the model over both networks

  + S(
    ~ edges + mutual + nodeifactor( "white" )
    ~ ( block == 1 ), # here is the constraints over the first network (i.e. block == 1)

  constraints = ~ blocks( "block", levels2 = c( 2, 3 ) )
)

My question is this: when I estimate the subgraph portion with S(, do I need to include the edges and mutual terms if I am only interested in the nodeifactor( "white" ) term?

Please let me know if this question makes sense. Thanks!

Jacob Young<https://urldefense.com/v3/__https:/jacobtnyoung.github.io/__;!!IKRxdwAv5BmarQ!fqLVLF3BCyy5ugkZ-qzDMnh1UexUEvlbM3sKV55pnP36VE1fwhB9906Cx5mulWUssxqdrCD3LDW7NjBYKNl_JYf-kGsUbys$>, PhD
Associate Professor | School of Criminology and Criminal Justice
Director of Curriculum | Institute for Social Science Research
Watts College of Public Service & Community Solutions

Arizona State University
411 N. Central Ave., Ste. 600
Phoenix, AZ 85004

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