This term adds one network statistic to the model for each element in d where the \(i\) th such statistic equals the number of dyads in the network with exactly d[i] shared partners.
# binary: ddsp(d, type="OTP")# binary: dsp(d, type="OTP")
a vector of distinct integers
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.
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", "dsp", "subsection")