Harmonize municipality codes across boundary reforms

Remap municipality_code (kommunenummer) to the classification valid at a target date, using correspondence tables from SSB's KLASS system (classification 131). Handles the 2020 municipal reform (428 → 356 municipalities) and 2024 county reversals.

Usage

brreg_harmonize_kommune(
  data,
  target_date = Sys.Date(),
  col = "municipality_code"
)

Arguments

data

A tibble with a municipality code column.

target_date

Date. Remap all codes to the classification valid at this date. Default: today.

col

Column name containing municipality codes. Default "municipality_code".

Value

The input tibble with two added columns: {col}_harmonized (the remapped code) and {col}_target_name (municipality name at the target date). Unmatched codes pass through unchanged.

See also

brreg_harmonize_nace() for NACE code harmonization.

Other tidybrreg harmonization functions: brreg_harmonize_nace()

Examples

if (FALSE) { # interactive() && curl::has_internet()
# \donttest{
# Remap old codes to current boundaries
df <- tibble::tibble(municipality_code = c("0301", "1201", "0602"))
brreg_harmonize_kommune(df)
# }
}