[statnet_help] Appropriate ergm-terms in R for <bridge> ?

[Carter T. Butts]

Hi, Yu Guo -

You may want to take a look at the graphlet orbit terms in the 
ergm.graphlets package (https://github.com/CarterButts/ergm.graphlets).  
It is certainly possible to model the propensity for those with 
particular attributes to serve as bridges (for many different kinds of 
local bridges, though the one you probably have in mind is orbit 2), 
though there is not a specific form that selects for the full set of 
brokerage roles (e.g., you can model the propensity for those in group A 
to serve as brokers in general, but not the propensity for those in 
group A to broker relations between members of group B per se).  This is 
also distinct from the inhomogeneous 2-stars, since the lack of closure 
here is important (which the graphlet terms do respect).

If you need precisely this term, then the most direct approach is to 
code it up oneself using ergm.userterms.  As terms go, this one is not 
too hard, though some C is involved.  You might first want to see if you 
can get the observed level of brokerage to emerge from other factors, in 
any event, rather than start by positing a generative force for 
itinerant brokerage.

Hope that helps,

-Carter

On 10/23/22 11:36 PM, Yu Guo wrote:

>

> Dear all,

>

> I hope this email finds you well.

>

>

> I am currently working on a project with one-mode networks. We're 

> interested in understanding how to achieve the <bridgeconfiguration> 

> with ergm-term in R. We hypothesized :

>

>  1. Actors who are with "female"(for example) attributes would be more

>     likely to play a bridge for the other two actors with the

>     attributes of "male".

>

> I'm unsure if there are any ERGM-terms in R that can aptly capture the 

> hypothesis. And any advice would be greatly appreciated! Thank you!

>

> Best,

>

> Yu Guo, Ph.D.

>

> Harbin institution of technology

>

>

> _______________________________________________

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