Accuracy and reliability
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Research, Technology and Culture, Business StatisticsHelle Månsson
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The survey was voluntary with a response rate of 36 per cent, and therefore the uncertainty will be higher than in a survey with a much higher response rate. Measurement errors are believed to be very small, as nearly all questions in the survey are qualitative.
Overall accuracy
As the survey is based on a sample, uncertainty is attached to all the figures in the form of random variation. This applies, in particular, to the results broken down according to the most detailed industry, region and size figures, where the figures should only be regarded as normative.
Sampling error
Sampling errors have not been calculated for this statistics.
Non-sampling error
The 64 per cent non-response is believed to be the primary source of uncertainty.
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 questionnaire has been tested, which should secure a good understanding of the questions for the respondents. At the same time, the population has been scrutinized carefully, and the electronic questionnaire has guided the respondents through the relevant questions. Nearly all questions are qualitative, which - according to previous experiences - result in fewer mistakes than quantitative questions.
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
Not relevant for these statistics.