Documentation of statistics: Business Services in the Sector for Market Research and Public Opinion Polling (Discontinued)
The statistics is produced according to the guidelines in the European Business Statistics Manual, and it is thus comparable to the similar statistics
https://www.dst.dk/en/Statistik/dokumentation/documentationofstatistics/business-services-in-the-sector-for-market-research-and-public-opinion-polling--discontinued-
Documentation of statistics