Statistical processing

Source data

Generally: The Central Register of Motor Vehicles up to 2007 inclusive, from 2008 from SKAT (the overall tax authority)). From 2012 the Digital Motor Register, DMR. Statistics Denmark's registers.

Data concerning the vehicles: The main source of data in the register is DMR, from which data concerning both new and existing vehicles are supplied monthly. Elderly (former registered) vehicles are in the register as well.

The registration of data has been based on forms submitted to the offices of the Central Register of Motor Vehicles / tax centers, typically when the owner or the retail firm wants to perform a transaction (for example a new registration, a change in ownership or a technical alteration). From January 1, 2008 SKAT took over the police assignments regarding the register. The assignments are registration of vehicles and collecting duties. Approximately 60 centres for motor vehicles was shut down. See also Homepage of the tax authorities regarding Motor vehicles..

In June 2012 DMR launched an on-line system to registrations to be used by dealers and others the car market.

The source of most of the technical data of the vehicles is the (standard) type approval, of which there are two main forms; one that is uniform for the EU (and for all similar vehicles) and one that is individual for a smaller group of vehicles or a single vehicle.

MOT-data on all vehicles that have passed a MOT-test are supplied monthly from Trafikstyrelsen (Danish Transport Authority). These data can be joined to the vehicles in the car-register, but they are not incorporated in the register.

DMR is delivered with a system-to-system solution while there are direct access to the population statistical registers. Extract from the business register is delivered as a SAS-file.

Data regarding vehicle owners: The background data concerning vehicle owners are delivered from a range of registers in Statistics Denmark.

• The Register of Enterprises and Establishments; Note the documentation of statistics for general enterprise statistics, under the subject General economic statistics.
• The Income Statistics Register; Note the documentation of statistics for Family income, under the subject Income, consumption and prices.
• The Register of Buildings and Dwellings; Note the documentation of statistics for Family income, under the subject Income, consumption and prices.
• The Employment Classification Module; Note the documentation of statistics for Family income, under the subject Income, consumption and prices.
• The Education Classification Module; Note the documentation of statistics for Family income, under the subject Income, consumption and prices.
• The Central Register of Information Forms of the Inland Revenue Department; Note the documentation of statistics for Personal income, under the subject Income, consumption and prices.
• The Population Statistics Register; Note the documentation of statistics for Household and families statistics, under the subject Population and elections.

Frequency of data collection

• Data from the Digital Motor Register, DMR are delivered monthly.
• Data from The Register of Enterprises and Establishments are delivered quarterly.
• MOT-data on all vehicles that have passed a MOT-test are delivered monthly.
• Data on persons/families - income, education, occupation, dwelling etc. are updated yearly.

Data collection

• Data from the Digital Motor Register, DMR are delivered thru a system to system solution.
• Data from The Register of Enterprises and Establishments are delivered as a SAS-file.
• MOT-data on all vehicles that have passed a MOT-test are delivered as an Excel-file.
• Data on persons/families - income, education, dwelling etc. are accessible by reading directly in the data base files.

Data validation

There are no routines with respect to quality and errors in the register as the Digital Motor Register, DMR - the main data source - is well equipped with controls and constraints.

A range of cross table controls are established in the production systems of the different publications to prevent discrepancy between new and elderly versions of the same figures and to prevent simple errors across published figures.

The other mentioned registers are validated by the producers in Statistics Denmark.

Data compilation

The monthly deliveries from the Digital Motor Register, DMR consist of approx. 400 data base tables. The key tables are processed to data files with new registrations, re-registrations, owner shifts, user shifts and stocks respectively.

There are no other operations such as imputations or corrections performed on the data.

Adjustment

Seasonal adjustment are performed for the series:

• new registrations of passenger cars, total
• new registrations of passenger cars in households
• new registrations of passenger cars in enterprises
• supply of new passenger cars, total
• supply of new passenger cars in households
• supply of new passenger cars in enterprises
• used car sale, total
• used car sale in households
• used car sales in enterprises

The quality indicators shows clear seasonal patterns and the series are therefore well qualified for correction.