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 the organisation and management of quality set out in the Code of Practice for European Statistics and the accompanying implementation model, the Quality Assurance Framework. Read more about these on the page Quality in official statistics.

Quality management is supported by common principles, guidelines and managerial responsibility for quality in statistical products and processes. The aim is to ensure a systematic and consistent approach to quality across the entire statistical production.

Quality assurance

Quality assurance at Statistics Denmark is integrated into the statistical production processes and is carried out in accordance with the principles of the Code of Practice for European Statistics. Read more on the page Quality in official statistics.

Quality assurance includes the continuous use of standardised procedures, documentation in line with international standards and internal controls related to data collection, data processing and dissemination. Experience gained from production is continuously used to identify needs for adjustments and improvements.

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.