The Use of Unlabeled Data in Predictive Modeling

Details The Use of Unlabeled Data in Predictive Modeling The Use of Unlabeled Data in Predictive Modeling

2007-10-25

arxiv.org/abs/0710.4618v1

Statistical Science 2007, Vol. 22, No. 2, 189-205

Statistics

Methodology

Published in at http://dx.doi.org/10.1214/088342307000000032 the Statistical Science (http://www.imstat.org/sts/) by the Insti

Scientific paper

10.1214/088342307000000032

The incorporation of unlabeled data in regression and classification analysis is an increasing focus of the applied statistics and machine learning literatures, with a number of recent examples demonstrating the potential for unlabeled data to contribute to improved predictive accuracy. The statistical basis for this semisupervised analysis does not appear to have been well delineated; as a result, the underlying theory and rationale may be underappreciated, especially by nonstatisticians. There is also room for statisticians to become more fully engaged in the vigorous research in this important area of intersection of the statistical and computer sciences. Much of the theoretical work in the literature has focused, for example, on geometric and structural properties of the unlabeled data in the context of particular algorithms, rather than probabilistic and statistical questions. This paper overviews the fundamental statistical foundations for predictive modeling and the general questions associated with unlabeled data, highlighting the relevance of venerable concepts of sampling design and prior specification. This theory, illustrated with a series of central illustrative examples and two substantial real data analyses, shows precisely when, why and how unlabeled data matter.

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