Accuracy and reliability

Overall accuracy

These statistics gives a precise picture of the populations' total turnover, as this is taken from the Accounts Statistics for Non-Agricultural Private Sector.

There can be some uncertainties regarding the distribution of turnover on the various products, this can be due to missing responses, wrong activity codes, business closure, uncertainty regarding enterprise size at the time of sampling from the Business Stastistical Registry and that enterprises can have difficulties coupling their activities with the questions.

There is a large certainty around the overall turnover distribution amongst products, as the received questionnaires covers between 96 and 100 pct. of the total turnover within each population. As these statistics do not account for enterprises with less than 20 employees (less than 5 for legal activities) it is likely that the product breakdowns within each activity would be different if smaller enterprises were included.

For each activity the useable questionnaires covered the following share of the total turnover within the target population:

• Computer services: 97 pct.
• Temporary employment agencies and other human provision services: 96 pct.
• Advertising services: 97 pct.
• Legal activities: 99 pct.
• Architectural activities: 99 pct.
• Market research and public opinion polling: 99 pct.
• Engineering activities and related technical consultancy: 96 pct.
• Technical testing and analysis: 100 pct.
• Accounting, book-keeping and auditing activities: Not collected for 2023
• Business and management consultancy activities: Not collected for 2023

Sampling error

The sampling error is equal to zero, as all enterprises within the population are requested to submit.

Non-sampling error

The population is defined by the industry concerned, the enterprises registered in the Business Register by themselves, which corresponds the the industry they're registered with in CVR - Central Business Register. Errors of classification of the industries is expected. This means that there may be enterprises in the population that really should not be classified as an enterprise in the concerned industry, but also companies in the concerned industry can be classified with the wrong industry.

In the context of fault tracing and quality assurance of the statistics, a number of these errors continuously are found and corrected. Companies that are incorrectly classified within the concerned industry incorrectly increases the number of included enterprises.

On the other hand there will be less enterprises in the population if they are classified entirely outside the concerned industry, even though they should properly be classified within the concerned industry, which can be difficult difficult to detect, but can be found also. The significance of these coverage problems are generally small because the volume is estimated to be small.

Uncertainty due to lapse, incorrectly reported numbers and misunderstandings has sought to minimize by repeated reminders by non-reporting, as well as by substantial verification of the reported figures.

Generally the services in the questionnaire are based on Statistical Classification of Products by Activity CPA CPA 2.1, with an adjustment to Danish conditions. There can be uncertainties in the distribution of turnover and export by services when the services CPA 2.1are not quite commensurate with the classification of products of the firms.

Displayed below is the number of useable submissions and lapse percentages for each activity in 2023 based on the total population of units within each activity:

• Computer services: 741 useable questionnaires within the population of 803 units, equal to a lapse of 8 percent.
• Temporary employment agencies and other human provision services: 204 useable questionnaires within the population of 248 units, equal to a lapse of 18 pct.
• Advertising services: 95 useable questionnaires within the population of 106 units, equal to a lapse of 10 pct.
• Legal activities: 325 useable questionnaires within the population of 358 units, equal to a lapse of 9 percent.
• Architectural activities: 76 useable questionnaires within the population of 80, equal to a lapse of 5 percent.
• Market research and public opinion polling: 19 useable questionnaires within the population of 20 units, equal to a lapse of 5 percent.
• Engineering activities and related technical consultancy: 182 useable questionnaires within the population of 206 units, equal to a lapse of 12 percent.
• Technical testing and analysis: 33 useable questionnaires within the population of 33 units, equal to a lapse of 0 percent.
• Accounting, book-keeping and auditing activities: Not collected for 2023
• Business and management consultancy activities: Not collected for 2023

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 is considered to be of high quality due to following factors: The statistics is relevant as it illuminates the amount of services provided by enterprises with at least 20 employees within a range of service activities. The statistics is based on the common European classification of products by activity (CPA) which makes it possible to compare the Danish market for services within the given activities with those in other European countries. The statistics provides a precise and reliable picture of the turnovers distribution on the various services provided by enterprises with at least 20 employees within the given activities. The statistics is current under the precondition that the enterprises have to have submitted their annual accounts, hence the publication 11 months after the end of the reference year. The statistics is consistent in its use of the product classification by activity, however for some activities more granular breakdowns are used in the national publication. Its hard to compare the statistics over time due to several discontinuities in data due to changes to activity codes, classification of products, calculation and sampling methods, latest in 2023 where the targetpopulation was altered. The data used as basis for these statistics is of high quality, due to both a high rate of response and a thorough examination and validation of the submitted data.

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 publication is not revised.