Learning dependence from samples. (1st January 2014)

• Record Type: Journal Article
• Authors: Seth, Sohan; Príncipe, José C.
• Is Part Of: International journal of bioinformatics research and applications. Volume 10:Number 1(2014)
• Page Start: 43
• Page End: 58
• Publication Date: 2014-01-01
• Subjects: dependence -- conditional dependence -- mutual dependence -- mutual information -- conditional mutual information -- interaction information -- association -- conditional association -- interaction association -- variable selection -- causality -- metric space; Bioinformatics -- Periodicals; 570.285
• Languages: English
• ISSNs: 1744-5485

Abstract

Mutual information, conditional mutual information and interaction information have been widely used in scientific literature as measures of dependence, conditional dependence and mutual dependence. However, these concepts suffer from several computational issues; they are difficult to estimate in continuous domain, the existing regularised estimators are almost always defined only for real or vector-valued random variables, and these measures address what dependence, conditional dependence and mutual dependence imply in terms of the random variables but not finite realisations. In this paper, we address the issue that given a set of realisations in an arbitrary metric space, what characteristic makes them dependent, conditionally dependent or mutually dependent. With this novel understanding, we develop new estimators of association, conditional association and interaction association. Some attractive properties of these estimators are that they do not require choosing free parameter(s), they are computationally simpler, and they can be applied to arbitrary metric spaces.