Classify codes for the administrative divisions of China

Source: R/classify.R

Categorizes six-digit administrative division codes of the People's Republic of China (as per GB/T 2260-2007) into several structured components, including province, city, area type (urban/rural), registry code, and regional classification.

classify_areacode(x)

Arguments

x

A vector of six-digit Chinese administrative area codes, either as numeric or character strings.

Value

A list with the following named elements:

  • areacode: Validated area codes. Invalid entries are replaced with NA.

  • registry: Registry codes corresponding to each area, using a built-in or cached dictionary.

  • province: Province-level codes formed by taking the first two digits and appending "0000".

  • city: City-level codes formed by taking the first four digits and appending "00".

  • area_type: Urban-rural classification codes: "910000" for urban, "920000" for rural. This can be updated using write_registry() function which stored the dictionary in (area_type_dict.rds)

  • region: Region classification codes derived from province codes, ending in "0000".

Details

This function standardizes and validates area codes, identifies their administrative levels, and attaches metadata used in cancer registration systems. It also supports external dictionaries (from the canregtools configuration folder) to provide more accurate classification of area types and registry mapping. Classify Codes for the administrative divisions of the People's Republic of China(GB/T 2260-2007) into different categories, including 'province', city', 'area_type', and 'registry' attributes.

See also

write_registry()

Examples

classify_areacode(c("110000", "320500", "440300"))
#> $areacode
#> [1] "110000" "320500" "440300"
#> 
#> $registry
#> [1] "110000" "320500" "440300"
#> 
#> $province
#> [1] "110000" "320000" "440000"
#> 
#> $city
#> [1] "110000" "320500" "440300"
#> 
#> $area_type
#> [1] "910000" "910000" "910000"
#> 
#> $region
#> [1] "720000" "740000" "760000"
#>