Calculate Boyce Clark Ratio — comp_bc • redistmetrics

Calculate Boyce Clark Ratio

comp_bc(plans, shp, epsg = 3857, ncores = 1)

Arguments

plans: A redist_plans object or plans_matrix where each row indicates a district assignment and each column is a plan.
shp: A redist_map object, tibble, or data frame with an sf geometry column.
epsg: Numeric EPSG code to use to project the shapefile, if needed. Default is 3857.
ncores: Integer number of cores to use. Default is 1.

Value

A numeric vector. Can be shaped into a district-by-plan matrix.

References

Boyce, R., & Clark, W. 1964. The Concept of Shape in Geography. Geographical Review, 54(4), 561-572.

Examples

data(nh)
data(nh_m)
# For a single plan:
comp_bc(plans = nh$r_2020, shp = nh)
#> [1] 0.7921350 0.8330235

# Or many plans:
# \donttest{
# slower, beware!
comp_bc(plans = nh_m[, 3:5], shp = nh)
#> [1] 0.8101242 0.9241602 0.8464224 0.8425670 0.8893711 0.8142303
# }