Creates a new distance specification from the union of two or more
distance specifications. The constituent distances specifications
may have overlapping treated and control units (identified by the
The distance specifications (as created with with
For combining multiple distance specifications with common
controls, but different treated units,
a way to combine the different objects. Likewise,
cbind provides a way to combine distance
specifications over common treated units, but different control
distUnion can combine distance units that have common
treated and control units into a coherent single distance
object. If there are duplicate treated-control entries in multiple
input distances, the first entry will be used.
An InfinitySparseMatrix object with all treated and control
units from the arguments combined. Duplicate entries are resolved
in favor of the earliest argument (e.g.,
will favor entries in
A over entries in
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