Accuracy and reliability

Overall accuracy

No quantitative assessment of the uncertainties have been performed. The resource account for natural aquatic resources cover approximately 90 pct. of the Danish stock calculated based on the catch in 2021. The missing coverage can be explained by insufficient information on less important species. The resource account for aquaculture is assessed to cover 100 pct. of the Danish stock ad the fish farms are obliged to report to the authorities annually.

Sampling error

Not relevant for these statistics.

Non-sampling error

Measurement errors/reporting errors may occur for Danish catch and fish and activities in aquaculture. These conditions are described in the Documentation of statistics for catches by the Danish fishing fleet and for Danish aquaculture.

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 coverage for natural aquatic resources is assessed to be high for 90 pct. of the Danish stock. The international stock assessments are based on catch and mathematical models and the quality is assessed to be highest on the most frequently occurring species (by weight). The coverage of the resource account for aquaculture is assumed to be 100 pct.

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

For some species ICES revise the estimates of the stock during the whole time series. As common practice in the national accounts the new year is added to the stock account and the two previous years are revised if the ICES estimates has been changed.