[statnet_help] Error in ergm_proposal.NULL when setting up bridge sampling

[Katy Yu]

Dear Statnet Community,

I am reaching out for assistance regarding an issue we encountered in our
research on Cross-National Collaboration in Open-Source Software
Development. Our study investigates cultural and religious divisions in
online social interactions, inspired by Huntington's theory of post-Cold
War divisions structured by culture and religion.

Our analysis utilizes ERGM to quantify country-level homophily within eight
"civilizations" as classified by Huntington. The network data comprises a
directed network with each node representing a country. The edges denote
cross-country collaborations on GitHub, encompassing 91 nodes and 425 edges.

While the basic ERGM model "edges + nodematch('civilizations', diff =
TRUE)" provides statistics successfully, we encounter an error when
integrating additional methods such as 'mutual'. This error occurs even
after the model converges.

[image: Screenshot 2024-01-25 at 12.19.28 PM.png]

We have attempted various constraints and explored online resources to
resolve this issue but to no avail. Could you kindly provide guidance or
suggest potential solutions to address this error?

Thank you for your support and expertise.

Kind regards,
Katy
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