Accuracy and reliability
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The aviation statistics is based on an exhaustive census, i.e. there is no sampling errors and total error in the final statistics is assessed to be very small.
Minor revisions do occur after first publication but the statistics are generally correct.
The statistics are in general reliable without systematic errors.
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.
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.
In general the quality of the statistics are assessed to be quite high. Data are collected for administrative purposes and response rate is very high. The collected information are consistent with the statistical concepts.
Revisions occur from time to time that introduces a slightly higher uncertainty on first disseminations but overall the uncertainty on passengers and tonnes are assessed to be less than 1 per cent.
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
Data is revised for current year until figures for a year is published.
If significant errors or revisions are detected, revisions are reflected in the statistics at first given opportunity.