[statnet_help] ergm algorithm from scratch

[MINGHUA ZHANG via statnet_help]

Hi Statnet,

My name is Minghua, and I am an undergrad at the University of Wisconsin, Madison. I am using ERGM in my research to model a healthcare referral network that is bipartite (with one set of nodes has outdegree strictly equal to 1 for every node) and contains missing edges. After reading some literatures and exploring the Statnet packages, I believe that Statnet is unable to handle this scenario. Thus, I tried to code up fitting algorithms that can handle this special case.

Currently, I am trying to just have a model that can fit the most general graph (undirected, unipartite, no missing info) with one graph feature, number of edges. After comparing with Statnet's result, I believe my theta update algorithm might not be accurate. My current theta updating method is from the book ERGM for Social Network by Lusher, Koskinen, and Robins using Raphson newton method. Details of the exact formulas are attached in the pdf.

I am wondering if you can point me to the literatures where I can find other updating algorithms, or codes where I can check out how statnet fit the model.

I am greatly appreciative of any help you can provide!

Best,
Minghua

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