This term adds a statistic equal to the geometrically weighted nonedgewise (that is, over dyads that do not have an edge) shared enemy distribution with decay parameter. For a directed network, multiple shared enemy definitions are possible.
# binary: gwnse(decay, fixed=FALSE, cutoff=30, type="OTP", base=NULL, in_order=FALSE)nonnegative decay parameter for the shared enemy or selected directed analogue count; required if `fixed=TRUE` and ignored with a warning otherwise.
optional argument indicating whether the `decay` parameter is fixed at the given value, or is to be fit as a curved exponential-family model (see Hunter and Handcock, 2006). The default is `FALSE` , which means the scale parameter is not fixed and thus the model is a curved exponential family.
This optional argument sets the number of underlying NSE terms to use in computing the statistics when `fixed=FALSE`, in order to reduce the computational burden. Its default value can also be controlled by the `gw.cutoff` term option control parameter. (See `?control.ergm`.)
A string indicating the type of shared partner or path to be considered for directed networks: `"OTP"` (default for directed), `"ITP"`, `"RTP"`, `"OSP"`, and `"ISP"`; has no effect for undirected. See the section below on Shared partner types for details.
specify the base of the triad, either by '+' and '-' or 1 and -1
While there is only one shared partner configuration in the undirected case, nine distinct configurations are possible for directed graphs, selected using the `type` argument. Currently, terms may be defined with respect to five of these configurations; they are defined here as follows (using terminology from Butts (2008) and the `relevent` package): - Outgoing Two-path (`"OTP"`): vertex \(k\) is an OTP shared partner of ordered pair \((i,j)\) iff \(i \to k \to j\). Also known as "transitive shared partner". - Incoming Two-path (`"ITP"`): vertex \(k\) is an ITP shared partner of ordered pair \((i,j)\) iff \(j \to k \to i\). Also known as "cyclical shared partner" - Reciprocated Two-path (`"RTP"`): vertex \(k\) is an RTP shared partner of ordered pair \((i,j)\) iff \(i \leftrightarrow k \leftrightarrow j\). - Outgoing Shared Partner (`"OSP"`): vertex \(k\) is an OSP shared partner of ordered pair \((i,j)\) iff \(i \to k, j \to k\). - Incoming Shared Partner (`"ISP"`): vertex \(k\) is an ISP shared partner of ordered pair \((i,j)\) iff \(k \to i, k \to j\). By default, outgoing two-paths (`"OTP"`) are calculated. Note that Robins et al. (2009) define closely related statistics to several of the above, using slightly different terminology.
[`ergmTerm`] for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "gwnse", "subsection")