1. KDD Cup 1998 Data: This is the data set used for The Second International Knowledge Discovery and Data Mining Tools Competition, which was held in conjunction with KDD-98
2. Automobile: From 1985 Ward's Automotive Yearbook
3. Housing: Taken from StatLib library
4. Auto MPG: Revised from CMU StatLib library, data concerns city-cycle fuel consumption
5. YearPredictionMSD: Prediction of the release year of a song from audio features. Songs are mostly western, commercial tracks ranging from 1922 to 2011, with a peak in the year 2000s.