Many requests have come in regarding “training datasets” – to practice programming. Fortunately, the internet is full of open-source datasets! I compiled a selected list of datasets and repositories below. If you have any additions, please comment or contact me! For information on programming languages or algorithms, visit the overviews for R, Python, SQL, or Data Science, Machine Learning, & Statistics resources.
This list is no longer being maintained. There are other, more frequently updated repositories of useful datasets included in bold below:
paulvanderlaken.com 