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Accuracy and reliability

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Short Term Statistics, Business Statistics
Karina Moric and Nanna Nikander Nonboe-Nygaard
+45 39 17 30 32 and +45 39 17 32 65 and

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Nights spent on camp sites

The monthly statistic only covers campsites with at least 75 camping units. The annual statistics also cover campsites with 10-74 camping units. A possible source of error can be that the respondents have difficulties distinguishing between the concepts of nights spent and arrivals. Another possible source of error may be the fact that the reported data is in many cases based on estimations by the respondents. Missing answers are imputed which may lead to revisions of published data.

Overall accuracy

In the monthly survey the number of nights spent might be a bit underestimated in relation to the actual number of nights spent in campsites in Denmark as a cut-off limit of at least 75 camping units is used. Every year a survey on campsites with 10-74 units is made. Campsites with 10-74 units have a share of approx. 5 per cent of the total number of nights spent at campsites. As a consequence, the underestimation is not regarded significant.

A possible systematic source of uncertainty may be the difficulty distinguishing between the concepts of nights spent and arrivals. Another possible source of uncertainty may be that some reports are based on the respondents´ subjective estimations rather than factual registrations.

Sampling error

Not relevant for these statistics.

Non-sampling error

The statistics is a census, but the response rate for the monthly data is not a 100 per cent and there will therefore be a lack of reliability in terms of imputed values from campsites that have not disseminated information in time for a given month or year of reference. The respondents may have difficulties distinguishing between the concept of nights spent versus the concept of arrivals and this may lead to reporting errors. Regarding the permanent leased pitches an assumption of an average of 3 guests is used. The number of nights at permanent leased pitches are based on a factor for every month. Therefore the number of guests and nights spent at permanent leased pitches may have some kind of uncertainty but it is not regarded significant.

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

Camping statistics is a census based on data collected every month of all Danish campsites with 75 camping units or more and on a yearly basis campsites with 10-74 units. The census is based on campsites with business code 55.30 in The Danish Business Register. However, a few campsites may be registered under another business code when the campsite is operated as a secondary business, e.g. in relation to a grocery business. Thus, it is not certain that all relevant companies are represented in the census, but the population is thoroughly reviewed on an annual basis in order to find any newly opened businesses that are not registered yet or registered under another business code than 55.30. Since the population is relatively constant from year to year, the data are believed to be comparable from year to year.

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 preliminary monthly data do not deviate significantly from the final data. There may be revisions in data as a result of imputations made in missing values.