Accuracy and reliability
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Science, Technology and Culture, Business StatisticsChristian Törnfelt
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The statistics are compiled on the basis of (in principle) all zoos, aquariums and botanical gardens, but some non state-subsidized zoo do not answer the questionnaires. There will be the a low number of visitors for non state-subsidized zoo or gardens. State-subsidized zoo or gardens have a good coverage.
Overall accuracy
The survey is voluntary. Some non- state-subsidized zoos or botanical gardens decline to report to the investigation. All state-subsidized zoo and major non- state-subsidized units report the statistics every year. There are no uncertainty calculations, but the number of visitors to non- state-subsidized zoos or botanical gardens is too low. This will have an impact on the overall number of visitors. Only few and easily accessible information is requested and therefore there is no measurement errors.
Sampling error
There is no sample.
Non-sampling error
Reporting to the statistics for zoos and botanical gardens is voluntary. Therefore some smaller zoos and botanical gardens choose not to report to the statistics. The large units report annually.
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 survey is voluntary. Some smaller non state-subsidized zoos or aquariums refuse to participate. All state-supported zoos participate. On the website of Statistics Denmark there is an Excel spreadsheet containing information about individual zoos or botanical gardens.
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 statistics is published.