## Abstract

A variety of mining and analysis problems - ranging from association-rule discovery to contingency table analysis to materialization of certain approximate datacubes - involve the extraction of knowledge from a set of categorical count data. Such data can be viewed as a collection of "transactions," where a transaction is a fixed-length vector of counts. Classical algorithms for solving count-data problems require one or more computationally intensive passes over the entire database and can be prohibitively slow. One effective method for dealing with this ever-worsening scalability problem is to run the algorithms on a small sample of the data. We present a new data-reduction algorithm, called EASE, for producing such a sample. Like the FAST algorithm introduced by Chen et al., EASE is especially designed for count data applications. Both EASE and FAST take a relatively large initial random sample and then deterministically produce a subsample whose "distance" - appropriately defined - from the complete database is minimal. Unlike FAST, which obtains the final subsample by quasi-greedy descent, EASE uses epsilon-approximation methods to obtain the final subsample by a process of repeated halving. Experiments both in the context of association rule mining and classical X^{2} contingency-table analysis show that EASE outperforms both FAST and simple random sampling, sometimes dramatically.

Original language | English (US) |
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Pages | 59-68 |

Number of pages | 10 |

DOIs | |

State | Published - 2003 |

Event | 9th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, KDD '03 - Washington, DC, United States Duration: Aug 24 2003 → Aug 27 2003 |

### Other

Other | 9th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, KDD '03 |
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Country/Territory | United States |

City | Washington, DC |

Period | 8/24/03 → 8/27/03 |

## Keywords

- Association rules
- Count dataset
- Data streams
- Frequency estimation
- OLAP
- Sampling

## ASJC Scopus subject areas

- Software
- Information Systems