Here is some good links for some public datasets for testing data mining algorithms:

All the datasets of the previous SIGKDD KDD-CUP. Some of them are very large!

The UCI KDD Archive that contains around 40 larges datasets of different types.

The UCI Machine Learning repository offers 185 public datasets.

The Frequent Itemsets Mining Datasets Repository provides many classical datasets for frequent itemset mining. It also includes several implementations of classical algorithm such as Apriori and others for mining frequent itemsets, frequent closed itemsets, maximal itemsets, etc.

A few datasets and implementations of data mining algorithms can also be found on the web page of M. Zaki.

A lots of links to free datasets : http://www.kdnuggets.com/datasets/index.html

Thanks.

That is some very useful information!

Brad

Thanks for that great list!

I would like to add a few more :

University of Edinburgh Data Mining datasets : [www.inf.ed.ac.uk]

PSLC Datashop, datasets from the learning science community : [pslcdatashop.web.cmu.edu]

Yale Face database : [cvc.yale.edu]

A list of datasets : [www.datawrangling.com]

Some biomedical datasets:

[datam.i2r.a-star.edu.sg]