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
rownames and colnames respectively).
distUnion(...)The distance specifications (as created with with
match_on, exactMatch, or other distance
creation function).
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., distUnion(A, B)
will favor entries in A over entries in B).
For combining multiple distance specifications with common
controls, but different treated units, rbind provides
a way to combine the different objects. Likewise,
cbind provides a way to combine distance
specifications over common treated units, but different control
units.
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.