Accuracy and reliability
Contact info
Short term statistics, Department of business statistics.Søren Dalbro & Karina Moric
+45 29 35 74 60
Get as PDF
The register and the publications are generally highly precise and reliable with only very limited changes to former published data. These corrections does by experience only result in very limited corrections in the main figures formerly published, i.e. less than 0.5 per mille.
The seasonal adjusted series are of good quality with well-defined seasonal patterns.
The number of families in the publications of the families' purchase of or access to private cars are fully compatible with the numbers in the area of population statistics.
Overall accuracy
The register and publications with vehicles:
The register and the publications are generally highly reliable with only very limited changes to former published data.
There are in principal no delayed registrations in the Digital Motor Register, (DMR), but corrections to former registrations may occur.
These corrections does by experience only result in very limited corrections in the main figures formerly published, i.e. less than 0.5 per mille.
The seasonal adjusted series are of good quality with well-defined seasonal patterns.
There have been some chances in the autumn of 2012 regarding the taxation rules of some vehicles used in the business sector, which have caused some alterations in the seasonal patterns of the business purchase.
In the statistics in the StatBank on families’ car availability/car purchases, there is full agreement with the family statistics in the population statistics.
Sampling error
Not relevant for these statistics.
Non-sampling error
Not relevant for these statistics.
Quality management
Statistics Denmark follows the recommendations on organisation and management of quality given in the Code of Practice for European Statistics (CoP) and the implementation guidelines given in the Quality Assurance Framework of the European Statistical System (QAF). A Working Group on Quality and a central quality assurance function have been established to continuously carry through control of products and processes.
Quality assurance
Statistics Denmark follows the principles in the Code of Practice for European Statistics (CoP) and uses the Quality Assurance Framework of the European Statistical System (QAF) for the implementation of the principles. This involves continuous decentralized and central control of products and processes based on documentation following international standards. The central quality assurance function reports to the Working Group on Quality. Reports include suggestions for improvement that are assessed, decided and subsequently implemented.
Quality assessment
The register and publications with vehicles:
Generally, the register and the publications are highly reliable with only very limited changes to former published data.
The seasonal adjusted series are of good quality with well-defined seasonal patterns.
Data revision - policy
Statistics Denmark revises published figures in accordance with the Revision Policy for Statistics Denmark. The common procedures and principles of the Revision Policy are for some statistics supplemented by a specific revision practice.
Data revision practice
The calculation of new registration and used car sale figures for the previous 25-36 months in StatBank Denmark are revised at every new release.
The seasonally adjusted figures are revised back to January 2000 at every new release. An updated version of the seasonal adjustment software is applied from January 2016.