Accuracy and reliability

Overall accuracy

In general, the quality of the statistics is rated acceptable.

For the reference year 2022 there are 242 enterprises in the sample, covering approx. 99 per cent of the total turnover in the FRAME population for Legal activities. 242 enterprises answered the questionnaire, i.e. the response rate is 100 percent. The usable questionnaires are from 241 enterprises. There is a lapse of 1 per cent. The lapse are due to wrong industry code and closure of the enterprises and non-responded questionnaires.

The usable data from 241 enterprises grossed up to the total level (the target population) of the 6-digit industries within the sector for Legal activities by using preliminary turnover from the Business Register. Each company is assigned a weight, that corresponds to the ratio of population and responses in a given size group and industry. The enumeration is made by ratio estimation.

As the survey is random, the figures can be associated with some statistical uncertainty in the form of random variation. The sampling error is calculated for all services in the form of variance, 95 pct. confidence interval and coefficient of variation Uncertainty estimates can be seen in the attached document usikkerhedsestimater_JUBI.

The figures for 2022 are preliminary and will not revised in the national publishing. For delivery to EU the figures are calculated (revised) based on Accounts Statistics.

Sampling error

The sample was drawn at 2022 consisting of 242 enterprises. Of these, 242 companies have completed the questionnaire, i.e. the response rate is 100 percent. The usable questionnaires were from 241 enterprises.

The sampling error is calculated for all services in the form of variance, 95 pct. confidence interval and coefficient of variation Uncertainty estimates can be seen in the attached document usikkerhedsestimater_JUBI.

Non-sampling error

The total uncertainty consists of sampling uncertainty and other systematic uncertainty. In other uncertainties include inter alia measurement error and non response error/lapse.

Coverage error:

The population is defined by the industry, the enterprises registered in the Business Register by themselves. Errors of classification of the industries will be expected. This means that there may be enterprises in the population that really should not be classified as an enterprise in the sector for Legal activities, but also companies in the sector for Legal activities can be classified with the wrong industry.

The total number of enterprises in the FRAME population is estimated to 261, and among these the sample is selected. The sample for the reference year 2022 was 242 companies and is thus 93 percent. of the total number of the population. Because of the stratified selection, where large companies are more likely to selection than the smaller, the sample consists approx. 99 percent. of the total turnover of the FRAME population.

Measurement error:

Inaccuracy due lapse, incorrect data and misunderstanding is minimized by repeated reminders of non-reporting, as well as by substantial verification of the reported figures.

Generally the questions in the questionnaire are based on Statistical Classification of Products by Activity CPA 2008 with adjustments to Danish conditions. It can be an inaccuracy in the distribution of the turnover and the export by services, because the distribution of the services in the questionnaire does not correspond exactly to the distribution of the enterprises.

Non response error:

There are 242 enterprises in the sample. The usable questionnaires are from 241 enterprises, i.e. there is a lapse of 1 per cent.

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

It can be problems in comparing figures over time. This is because the questionnaire has been revised a few times since 2003. Moreover, from the reference year 2013 the method is changed so the enumeration is based on a new data from the Central Business Register. Data are back calculated for 2012. Which means that the results before the year 2012 are not directly comparable to the results from 2012 onwards.

For the reference year 2022 there are 242 enterprises in the sample, covering approx. 99 per cent of the total turnover in the FRAME population for Legal activities. 242 enterprises answered the questionnaire, i.e. the response rate is 100 percent. The usable questionnaires are from 241 enterprises. There is a lapse of 1 per cent. The lapse are due to wrong industry code and closure of the enterprises and non-responded questionnaires.

The usable data from 241 enterprises grossed up to the total level (the target population) of the 6-digit industries within the sector for Legal activities by using preliminary turnover from the Business Register. Each company is assigned a weight, that corresponds to the ratio of population and responses in a given size group and industry. The enumeration is made by ratio estimation.

As the survey is random, the figures can be associated with some statistical uncertainty in the form of random variation. The sampling error is calculated for all services in the form of variance, 95 pct. confidence interval and coefficient of variation Uncertainty estimates can be seen in the attached document usikkerhedsestimater_JUBI.

The figures for 2022 are preliminary and will not revised in the national publishing. For delivery to EU the figures are calculated (revised) based on Accounts Statistics.

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, since the statistics is published once a year.