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    Merging of Projects

    It is possible to merge projects. This may be relevant if you wish to broaden existing projects.

    With the new pricing model being introduced in 2026 and 2027 (read more here), there may also be a financial advantage to merging projects, as payment thereafter will be calculated based on the number of users and the number of data packages in each project.

    When should you merge projects?

    Research Services (RS) recommends that you already begin considering which projects may beneficially be merged, but wait with the actual merging until the new pricing model comes into effect in January 2026.

    How to merge projects

    1. Contact Research Services (RS)
      • Contact the RS project owner responsible for one of the projects you wish to merge and specify which projects you want to merge.
      • RS will assess whether the projects should be combined into a new project proposal or under an existing project with a broader project description.
    2. New project proposal is created or previous proposal is revised
      • The project description must include purpose, description, and importance to society covering all projects to be merged. Keep the purpose broad, so that it is possible to cover several relevant aspects of a topic and expand the project along the way with new data.
      • Select relevant data in Denmark’s Data portal (DDP) and add additional data sources as well as any discontinued data from our databank of basic data with accompanying documentation. Paths to external data must be sent by email to the RS project owner responsible for the project.
      • Make sure to obtain and submit all necessary approvals from external data providers. This is a prerequisite before we can transfer data.
      • If one of the projects includes the Danish pharmaceutical products database (LMDB) or external data from the Danish Health Data Authority, you must apply for renewed approval to transfer data to the new project.
      • o Please note that LMDB and the Medicine statistics register (LSR) cannot be ordered for the same project.
    3. Submit project proposal
      • Once the project proposal has been submitted, the RS project owner will send a price contract based on a framework agreement. The framework agreement covers the processing of the project proposal, re-delivery of data from our databank of basic data, processing of external data and any discontinued registers, as well as the transfer of files and programs from the workdata folder.
    4. Approval, delivery, and completion
      • You agree on a deletion date for the old projects with the RS project owner.
      • RS and the signatory at your institution sign the new project.
      • If files from the workdata folder need to be transferred, you must send an email to the RS project owner with the path to both the old folders/files and the new project. In the email, you must confirm that the files do not contain microdata (e.g., key variables or other identifiable information).
      • RS delivers the data from our bank of basic data, external data and transfers the content from the workdata folders to the new project.

    Important points of attention

    • In rare cases, users may have hardcoded de-identified values. These cannot be retrieved after merging, as a new key will be applied.
    • The same applies if de-identified values have been used to remove outliers.
    • Sorting will change, as data is sorted by de-identified values. If row numbers have been used in programs (e.g., for random selection), these will no longer work.