An index proposed by Krackhard and Stern (1988) to capture relative prevalence of between- and within-group ties. From that perspective it can be interpreted as a measure of network segregation.
Usage
ei(object, ...)
# S3 method for table
ei(object, ...)
# S3 method for igraph
ei(
object,
vattr,
directed = is.directed(object),
loops = any(is.loop(object)),
...
)
# S3 method for default
ei(object, ...)Arguments
- object
R object, see Details for available methods
- ...
other arguments passed to/from other methods
- vattr
character scalar or vector of length equal to the size of
object, vertex attribute for which mixing matrix is to be computed- directed
logical whether the network is directed
- loops
logical, whether loops are allowed
Details
If object is a table it is interpreted as a mixing matrix.
Two-dimensional table is interpreted as a contact layer. Three-dimensional
table is interpreted as a full mixing matrix \(m_{ghy}\)
cross-classyfying all dyads, in which \(g\) and \(h\) correspond to
group membership of ego and alter respectively. Layers \(y=1\) and
\(y=2\) are assumed to be non-contact and contact layers respectively.
If object is of class "igraph" it is required to supply vattr
with the name of the vertex attribute to calculate intermediate mixing
matrix.