Accuracy and reliability

Overall accuracy

Refer to the original data sources and documentation for assessment of accuracy and reliability. No calculation has been made for the accuracy, but it is estimated that the figures are correct and precise, as they are based on key authoritative sources. Data are provided on the basis of authoritative sources in the form of the Central Association Register the and the Facility Database. There can be uncertainties in the use of register based databases in the form of error registration, time shifts as well as missing alerts. Error registrations could lead to shifts in data as well as time series. Time shifts are based on delays in the delivery of data, which can either exceed or underestimate the statistics. Missing reports will underestimate the statistics in the form of missing member information and registrations of new facilities.

Sampling error

Not relevant for these statistics.

Non-sampling error

The sports facility database is nationwide and a co-operation between the Danish Institute for Sports Studies and the Danish Foundation for Culture and Sports Facilities. The Danish Institute for Sports Studies is responsible for the gathering of data and the day-to-day operation and maintenance of the database. The facility database is updated continuously, and there may be discrepancies between the statistics and the facility database inventory. Extracts from the database are taken annually on 1 October. Memberships of sport associations are based on extracts from the Central Association Register, which are reported annually. Data is reported to the register from the sports associations. The database is administrated by DIF, DGI and DFIF.

These statistics are based on reported figures and may be vulnerable to inadequate or outdated information. The statistics do not take into account missing reports to the above-mentioned databases.

There are some discrepancies in the membership for 2019 compared to 2018, which relates to the table IDRFOR01. This is due to the fact that it is the local business sports associations that register how many people exercise at work in their local areas. It is a practice that is underway, with some of the local corporate sports associations registering exercise at the workplace to a greater extent than before. This applies, for example, in the municipality of Lemvig. In addition, the relocation of members between municipalities can be a cause of large member fluctuations, which is the case for Brønderslev and Albertslund in 2019. This is due to the fact that larger national associations during corporate sports are registered under the municipalities where the companies are headquartered.

In the database of sport facilities information about the individual sports facilities can be obtained at a more detailed level. This could e.g. be the number of football pitches, golf holes, etc. for a given facility. In addition, contact information, address and other practical information can be retrieved for the individual facility. This information is not included in the statistics, as this is counted at a facility level based on type and municipality. The statistics take into account that some previous facility types can be merged or new types added over time.

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 sports facility database is nationwide and a co-operation between the Danish Institute for Sports Studies and the Danish Foundation for Culture and Sports Facilities. Memberships of sport associations are based on extracts from the Central Association Register, which are reported annually. Data is reported to the register from the sports associations. The database is administrated by DIF, DGI and DFIF. Since the statistics are a estimates based on known authoritative sources and databases regarding the membership and facility numbers of sports organizations, it must be considered as precise and of high quality.

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 figures are published.