Count the number of incumbents paired with at least one other incumbent.
inc_pairs(plans, shp, inc)
A redist_plans
object or plans_matrix where each row indicates a district assignment and each column is a plan.
A redist_map
object, tibble, or data frame containing other columns.
Unqouted name of logical column in shp
indicating where incumbents live.
vector of number of incumbents paired