Accuracy and reliability
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Short Term Statistics, Business StatisticsPeter Ottoseen
+45 39 17 30 25
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The statistics are based of an exhaustive list of ships supplemented by information from the members of the shipowners' association to the association. The statistics cover seagoing vessels of 20 GT and above.
Registration of a vessel in a vessel register is necessary for insurance and legal purposes. Correct registration is thus of fiscal importance to the owners.
Overall accuracy
The statistics are very accurate with regard to the central measures: the number of vessels and the total tonnage.
Uncertainty on the uses and age of vessels is marginal and do not affect the overall assessment of the statistics.
Sampling error
Not relevant for the statistics.
Non-sampling error
There are smaller margins of uncertainty related to use of the ship, as some shipping types can be used in different ways and use of the ship can be changed over time. In cases where ships are decidedly rebuilt for a completely new use, the shipping register is however updated. In addition to this, the greatest margins of uncertainty are related to ships under 100 GT, which is exclusively based on the shipping register.
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 statistics are compiled on the basis of an administrative register for ships registered in Denmark with supplementary information from the Danish Shipping Council. The register-based information provides complete coverage for compiling the statistics. A quality measurement of the statistics is not conducted. Provisional figures are not published. The quality of the statistics is generally considered to be high, as the statistics are compiled on the basis of an administrative register, where especially the number of size of the ships are considered as information of a very high quality.
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
Only final figures are published.