Statistical processing

Source data

The commuting statistics are compiled based on RAS, which, from the publication on 28 April 2015, is based on the Labour Market Account (AMR). In this context, the commuting statistics have been revised back to November 2008. At the same time, the dating of the statistics was changed so that the statistics are now dated according to the reference point at the end of November.

For the commuting statistics, the information on employed persons’ workplace and residential addresses in RAS is particularly relevant, as these data form the basis for calculating commuting distances.

Frequency of data collection

The statistic is published yearly.

Data collection

Data for the statistics are collected through deliveries from the Register-based Labour Force Statistics (RAS).

Data validation

The non-hourly-based AMR (AMR-UN) forms the data basis for RAS and, consequently, the commuting statistics, with data validation carried out during the production of AMR-UN.

Data compilation

The commuting statistic is compiled on the register-based labour force statistic (RAS). RAS compiles the primary affiliation to the labour market at the end of November. Read more about the data production i RAS here.

Especially two variables from RAS are central for the commuting statistic - the address of residence and the workplace. Based on these information the distance between the persons residence and workplace is calculated. The calculation requires that all movements between residence and workplace is done by car; the shortest road distance is prioritized; and regimentations, turn restrictions and level crossings are taken into account. Approximately 93 pct. of all relations between residence and workplace can be calculated. The remaining 7 pct. can't be calculated due to inadequate information about address; the workplace is outside of Denmark or on a ship; or logic isolation. Logic isolation is e.g. a laboratory that has to be placed isolated and therefore is placed on an island without official ferry service.

In some cases the distance can be calculated even though the address is inadequate. If the address in RAS can't be retrieved from the address database a manual relocation to the nearest adjacent address in the database is done. Since this process is time consuming the relocation is only done for those addresses that have at least 100 persons employed or 20 persons resident.

If the reason is logic isolation an address in the port, from where there is information about ship transfer to the island, is defined. From this address a sail route to the island is specified and the length of this imaginary sail route is added to the distance between the start address and the end address.

All other non placeable addresses is gathered in municipal centers. The centers is calculated based on existing addresses of residence and workplace. On that basis the distance is calculated.

A commuting distance can thus be calculated for all employed persons in RAS except for those working abroad or on ships.

The average commuting distance is based on the commuting distance for all commuters.

Adjustment

No corrections of data besides what is described under data validation and data compilation.