Physics – Data Analysis – Statistics and Probability
Scientific paper
2003-07-10
Phys.Rev. E70 (2004) 046127
Physics
Data Analysis, Statistics and Probability
23 pages, 2 figures
Scientific paper
10.1103/PhysRevE.70.046127
The problem of assigning probability distributions which objectively reflect the prior information available about experiments is one of the major stumbling blocks in the use of Bayesian methods of data analysis. In this paper the method of Maximum (relative) Entropy (ME) is used to translate the information contained in the known form of the likelihood into a prior distribution for Bayesian inference. The argument is inspired and guided by intuition gained from the successful use of ME methods in statistical mechanics. For experiments that cannot be repeated the resulting "entropic prior" is formally identical with the Einstein fluctuation formula. For repeatable experiments, however, the expected value of the entropy of the likelihood turns out to be relevant information that must be included in the analysis. The important case of a Gaussian likelihood is treated in detail.
Caticha Ariel
Preuss Roland
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