1. Audiology (Standardized): Standardized version of the original audiology database 2. Balance Scale: Balance scale weight & distance database 3. Balloons: Data previously used in cognitive psychology experiment; 4 data sets represent different conditions of an experiment 4. Breast Cancer: Breast Cancer Data (Restricted Access) 5. Car Evaluation: Derived from simple hierarchical decision model, this database may be useful for testing constructive induction and structure discovery methods. 6. Chess (King-Rook vs. King-Pawn): King+Rook versus King+Pawn on a7 (usually abbreviated KRKPA7). 7. Congressional Voting Records: 1984 United Stated Congressional Voting Records; Classify as Republican or Democrat 8. Connect-4: Contains connect-4 positions 9. Hayes-Roth: Topic: human subjects study 10. LED Display Domain: From Classification and Regression Trees book; We provide here 2 C programs for generating sample databases 11. Lenses: Database for fitting contact lenses 12. Lymphography: This lymphography domain was obtained from the University Medical Centre, Institute of Oncology, Ljubljana, Yugoslavia. (Restricted access) 13. MONK's Problems: A set of three artificial domains over the same attribute space; Used to test a wide range of induction algorithms 14. Mushroom: From Audobon Society Field Guide; mushrooms described in terms of physical characteristics; classification: poisonous or edible 15. Nursery: Nursery Database was derived from a hierarchical decision model originally developed to rank applications for nursery schools. 16. Primary Tumor: From Ljubljana Oncology Institute 17. Shuttle Landing Control: Tiny database; all nominal values 18. Soybean (Large): Michalski's famous soybean disease database 19. Soybean (Small): Michalski's famous soybean disease database 20. SPECT Heart: Data on cardiac Single Proton Emission Computed Tomography (SPECT) images. Each patient classified into two categories: normal and abnormal. 21. Tic-Tac-Toe Endgame: Binary classification task on possible configurations of tic-tac-toe game 22. Trains: 2 data formats (structured, one-instance-per-line) | 
