varCovar: Function to create a changing covariate object.
Description
This function creates a changing covariate object from a matrix.
Usage
varCovar(val, nodeSet='Actors')
Arguments
val
Matrix of covariate values, one row for each actor, one
column for each period.
nodeSet
Character string containing the name of the associated
node set. If the entire data set contains more than one node set,
then the node sets must be specified in all data objects.
Value
Returns the covariate as an object of class 'varCovar', in which
form it can be used as an argument to SienaData.create.
Details
When part of a Siena data object, the covariate is assumed to be
associated with node set nodeSet of the Siena data object.