Accuracy and reliability

Overall accuracy

Statistics Denmark do not have the necessary knowledge to assess the differences in the treatment of measures in the municipalities. The differences in the municipal cases systems means, that municipalities do not register cases and measures uniformly. What is posted in one municipality in one section that is included in the register of vulnerable children and young people may in another municipality be registered under another section that is not reported.

Sampling error

Not relevant for these statistics.

Non-sampling error

Differences in the municipalities' case systems mean that not all municipalities register cases uniformly. What is posted in one municipality under one section that is included in the register, may in another municipality be registered under another section that is not reported.

Municipalities should report all measures, but it must be assumed that there are missing cases. If the case begins and ends within the same calendar year, Statistics Denmark will not discover the missing case during the validation procedures.

There may be some measurement error in the variable period. Some municipalities tend to set the start date on which the action is decided while other municipalities correctly specify the start date on witch the action takes effect.

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

Data is generally regarded as reliable.

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

The register is a progress register, which is updated yearly. The statistics are revised two years back in time, after which they are considered final.