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Data is reported to Statistics Denmark via virk.dk, a digital upload solution or an encrypted e-mail. The data collected is subsequently compared with previous reports and validated. When then data has been validated, the number of person nights spent is calculated by multiplying the boat nights spent with a factor on the average crew size on the boats. The crew size comes from a survey conducted by the national tourism board VisitDenmark.
Boat nights spent is the number of boats in the Danish marinas times the length of the stay. Person nights spent is the size of the crew on the boat times the length of the stay. The size of the crew is calculated by using an average factor.
The survey is compiled on the basis of reports from marinas receiving overnight visits by yachts and that are registered under NACE-code 93 and want to participate. In 2003, when the survey was still mandatory, the number of reporting marinas were 308. In comparison, the number of reporting marinas was 310 in 2004 when the survey became voluntary. Five years later, the number of reporting marinas was 280. In 2019, 261 marinas participated in the survey.
Frequency of data collection
Monthly and annually.
Data is disseminated on a monthly basis to Statistics Denmark via an online questionnaire on virk.dk, via a digital upload solution or via an encrypted e-mail.
The collected data are compared to the data from the previous year and potentially significant changes are examined, explained and corrected in case of errors. The variables in the questionnaire are also crosschecked for consistency.
Data is provided by marinas and then aggregated and validated. This procedure is followed by a summation of the data into totals broken down by nationality and geography. The survey is voluntary and based on a census. Data is imputed if an enterprise does not disseminate data within the given time frame.
Boat nights spent is the number of boats in the Danish marinas times the length of the stay. Person nights spent is the size of the crew on the boat times the length of the stay. The size of the crew is calculated by using an average factor. This factor is for Denmark, Germany and Sweden = 2.1 and for all other countries = 2.5.
There is not seasonal adjustments to the statistics as it does not contain data for all of the 12 months of the year.