Calculate Efficiency Gap (Equal Population Assumption)
part_egap_ep(plans, shp, dvote, rvote)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 column in shp with total population.
Unqouted name of column in shp with group population.
A numeric vector. Can be shaped into a district-by-plan matrix.
Nicholas O. Stephanopoulos. 2015. Partisan Gerrymandering and the Efficiency Gap. The University of Chicago Law Review, 82, Pp. 831-900.
data(nh)
data(nh_m)
# For a single plan:
part_egap_ep(plans = nh$r_2020, shp = nh, rvote = nrv, dvote = ndv)
#> [1] -0.02340617 -0.02340617
# Or many plans:
part_egap_ep(plans = nh_m[, 3:5], shp = nh, rvote = nrv, dvote = ndv)
#> [1] -0.02618429 -0.02618429 -0.02244022 -0.02244022 -0.02553128 -0.02553128