merge_by: Merge map units
In redist: Simulation Methods for Legislative Redistricting

merge_by

R Documentation

Merge map units

Description

In performing a county-level or cores-based analysis it is often necessary to merge several units together into a larger unit. This function performs this operation, modifying the adjacency graph as needed and attempting to properly aggregate other data columns.

Usage

merge_by(.data, ..., by_existing = TRUE, drop_geom = TRUE, collapse_chr = TRUE)

Arguments

`.data`	a `redist_map` object
`...`	`<tidy-select>` the column(s) to merge by
`by_existing`	if an existing assignment is present, whether to also group by it
`drop_geom`	whether to drop the geometry column. Recommended, as otherwise a costly geometric merge is required.
`collapse_chr`	if `TRUE`, preserve character columns by collapsing their values. For example, a county name column in Iowa might be merged and have entries such as "Cedar~Clinton~Des Moines". Set to `FALSE` to drop character columns instead.