Datasets are often difficult or impossible to find through normal search engines. Specialized tools have been developed to aggregate the results from around the web. Which tool to use depends on how broad or specific your search query will be. Common strategies include searching by:
When to use a data catalog? As a starting place if you are still trying to narrow down the topic you are interested in. Can also be helpful to find data repositories that allow for more specific searches.
The federal government provides free public access to vast amounts of data produced through both government operations and government-funded research.
A repository is a database intended for long-term preservation of research data.
Repositories are generally either categorized as general-use, meaning they accept data from any discipline, or disciplinary repositories, which focus on a particular research field or data type.