Accuracy and reliability

Overall accuracy

The statistical uncertainty is calculated at the totals to be +/- 0.05 and +/- 0.1 subtotals

Sampling error

The calculated sampling errors in the survey on the most central question shows that estimates the 10-year-groups are intended to +/- 0.1 and the total is intended to +/- 0.05. Be aware, however, that uncertainty is greater when only points the way at the municipal level.

Non-sampling error

Quality of life survey is a voluntary web-progression based chart study of the Danish population aged 18 and over. The total population in this age group has totaled 4.5 million. persons.

Statistics Denmark has tried to get a little over 70,000 people to respond to the questionnaires sent out, but it's only managed to get 42,500 people to fill out the questions. This gives a response rate of nearly 61 per cent., Which in a voluntary survey is satisfactory.

However, not all communities that are just nice to answer, which also results in different response rates between the groups.

If a community response point is under- or over-represented compared the answers, compensates Statistics Denmark this distortion at different types of enumeration (counting), so the end result will be an approximate distribution, similar to the population average. But the lack of response is the source of some form of statistical uncertainty because for understandable reasons, do not know what the people who have chosen not to answer, would have answered.

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 statistics are to give a true image of the quality of life in Denmark. Broken down by individual municipalities uncertainty is higher, and must always interpreted with care

The statistics are to give a fair picture of the quality of life in Denmark.

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

There has been no revisions to the statistics.