b1nodematch-ergmTerm | R Documentation |
This term is introduced
in Bomiriya et al (2014). With the default alpha
and beta
values, this term will
simply be a homophily based two-star statistic. This term adds one statistic to the model
unless diff
is set to TRUE
, in which case the term adds multiple network
statistics to the model, one for each of (a subset of) the unique values of the attr
attribute.
# binary: b1nodematch(attr, diff=FALSE, keep=NULL, alpha=1, beta=1, byb2attr=NULL,
# levels=NULL)
attr |
a vertex attribute specification (see Specifying Vertex attributes and Levels ( |
diff |
by default, one statistic will be added to the model. If |
keep |
deprecated |
alpha , beta |
optional discount parameters both of which take values from |
byb2attr |
specifies a
second mode categorical attribute. Setting this argument
will separate the orginal statistics based on the values of the set second mode attribute—
i.e. for example, if |
levels |
select a subset of |
If an alpha
discount parameter is used, each of these statistics gives the sum of
the number of common second-mode nodes raised to the power alpha
for each pair of
first-mode nodes with that attribute. If a beta
discount parameter is used, each
of these statistics gives half the sum of the number of two-paths with two first-mode nodes
with that attribute as the two ends of the two path raised to the power beta
for each
edge in the network.
This term can only be used with undirected bipartite networks.
The argument keep
is retained for backwards compatibility and may be
removed in a future version. When both keep
and levels
are passed,
levels
overrides keep
.
ergmTerm
for index of model terms currently visible to the package.
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