Here is a list of publicly available data sources that can be used in empirical projects such as a bachelor's or master's thesis on public policy or public health topics. If you want to chat about a potential project, feel free to reach out. The list is, of course, not exhaustive and will be updated continuously.
A note when searching for data: Most of the available Danish data exist at an aggregate level (municipalities, age groups, educational groups, etc.), but they are observed repeatedly across time (panel data structure). Conversely, most of the US-based data stems from thoroughly conducted surveys and is available at an individual level (but often with a repeated cross-sectional structure). When searching for data for an empirical project, such as a policy analysis, it is important to think about who is affected/targeted by the policy and whether this group can be identified in the data. As noted in The Mixtape in a US-based context, different states can implement different policies and reforms, which makes for many natural experiments. Most of the US data can be aggregated at a county or state level, making data availability more straightforward. Most Danish policies are generally not varying on a geographical level (or another level); therefore, it is often not straightforward to evaluate policies using aggregate-level data.
Danish data (other then Statistisk Banken from Statistics Denmark)
Different health care related data for Denmark
Education-related data
PIAAC Survey on skills among adults in 2012
Similarly PISA data is avaliable for school-aged children for more cohorts
US based data
Survey on risky behaviour, chronic condition and use of preventive care - BRFSS
Survey on the supply of physician services available across selected US states
Survey on child and adolescent vaccination status in the US
COVID-19 related data
Social connectedness index: An index based on facebook-friendship data that shows how likely it is that an individual living in a given geographical areas (for example a US state) has friends in other geograohical areas.
Social connectedness in the US and Europe.
Raj Chetty and colleagues has extended this data with measures of income and created a Social Capital Atlas in the US on economic connectedness (friendships between low-income and high-income users). The data is available here and Chetty and colleagues has written about it here and here
Sometimes authors of research articles will make their data available for others to replicate. The different scientific journals will host this data in som data repository. I have listed a few data repositories of public policy and public health related journals:
The book How to Write About Economics and Public Policy by Katerina Petchko is an excellent ressource on both how to structure a paper and what content to include + many examples from actual published research papers.