Impurity measures in databases |
| |
Authors: | Dan A Simovici Dana Cristofor Laurentiu Cristofor |
| |
Affiliation: | (1) University of Massachusetts at Boston, Department of Computer Science, Boston, MA 02125, USA (e-mail: {dsim,dana,laur}@cs.umb.edu) , US |
| |
Abstract: | We introduce purity dependencies as generalizations of functional dependencies in relational databases starting from the
notion of impurity measure. The impurity measure of a subset of a set relative to a partition of that set and the relative
impurity of two partitions allow us to define the relative impurity of two attribute sets of a table of a relational database
and to introduce purity dependencies. We discuss properties of these dependencies that generalize similar properties of functional
dependencies and we highlight their relevance for approximate classifications. Finally, an algorithm that mines datasets for
these dependencies is presented.
Received: 4 July 2000 / 16 November 2001 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|