Accuracy and reliability

Overall accuracy

The inventory contains information from all 98 municipalities. The statistics is based on register data and cover all children and staff enrolled in institutions with childcare after school. It is considered unlikely that a large number of children or staff will not be registered in the system, since registration regarding parental payment is used as part of the municipal administration. However, the overall precision can be influenced by staff who do not register institutions, employees or children correct.

Sampling error

Not relevant for these statistics.

Non-sampling error

The precision of the data is based on correctly registration from institutions and municipalities. Random errors such as incorrectly stated CPR numbers can cause employees and children to be underestimated in the inventories because Statistics Denmark removes duplicates and non-valid CPR numbers in processing of checking data for errors. It is assessed that such errors are random and therefore do not have a systematic effect on the precision of the statistics. It can be difficult for the institutions to assess how much time staff uses as teachers in the school as compared to the time they work in the SFO.

From 2015 to 2020 the data quality has substantially been improved. This is due to an increase dialogue with the data suppliers, an increasing amount of error detecting and an increased opportunity to discuss mistakes with the institutions.

The statistics are not expected to be directly effected by the COVID-19 situation as employees and children where not oblige to be home on the third of October 2020. However, fewer children where observed in 2020 compared with previous years. This could be due to parents keeping their children out of institutions after they have been sent home earlier that year because of the COVID-19 situation. For further information contact Statistics Denmark.

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

For children in childcare after school start, the statistics published in 2021 has all 98 municipalities included. For 2017-2019 it was also 98. However in 2016 it was only 78 municipalities which were published. For staff in childcare after school start, the statistics in 2021 had 98 muncipalities. In 2018 it was 95 muncipalities and in 2017 it was 72 muncipalities.

Statistics Denmark has searched the data for errors and validated the number of children and employees with each municipality. The criteria for a municipality to be included in the statistics consist of several steps and is an overall assessment of different criterias. It is a combination of the percentage deviation on relevant factors, the proportion of children compared to the proportion of staff in childcare after school (the ratio between children and employees).

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

Just final figures are published.