A Partial Order on Uncertainty and Information

Details A Partial Order on Uncertainty and Information A Partial Order on Uncertainty and Information

2011-08-06

arxiv.org/abs/1108.1505v1

Mathematics

Probability

Some easy to understand results on information inequalities. To appear in Journal of Theoretical Probability

Scientific paper

Information and uncertainty are closely related and extensively studied concepts in a number of scientific disciplines such as communication theory, probability theory, and statistics. Increasing the information arguably reduces the uncertainty on a given random subject. Consider the uncertainty measure as the variance of a random variable. Given the information that its outcome is in an interval, the uncertainty is expected to reduce when the interval shrinks. This proposition is not generally true. In this paper, we provide a necessary and sufficient condition for this proposition when the random variable is absolutely continuous or integer valued. We also give a similar result on Shannon information.

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