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Title
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Unsupervised Sequential Classification of Nonstationary Time Series
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Date
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1968
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Index Abstract
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Not Available
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Photo Quality
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Not Needed
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Report Number
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AMRL TR 67-230
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Creator
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Harley, Thomas J., Jr.
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Corporate Author
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Philco-Ford Corporation
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Laboratory
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Aerospace Medical Research Laboratories
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Extent
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40
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Identifier
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AD0680824
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Access Rights
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This document has been approved for public release and sale; its distribution is unlimited
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Distribution Classification
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1
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Contract
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AF 33(615)-2966
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DoD Project
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7233 - Biological Information Handling Systems and Their Functional Analogs
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DoD Task
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723305 - Theory of Information Handling
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DTIC Record Exists
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No
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Distribution Change Authority Correspondence
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None
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Distribution Conflict
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No
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Abstract
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The problem of unsupervised sequential classification of nonstationary time series is formulated as a compound decision problem. The a priori class probabilities are assumed to be stochastically independent, time varying, and unknown. The class-conditional cumulative distribution functions of the random variable, X, are assumed to be of known parametric form, but with the parameter values unknown and time varying. A Bayesian approach is taken, employing an a priori distribution on the unknown parameters and class probabilities, which leads to a solution in terms of minimizing the sample conditional risk. If the unknown parameters and class probabilities are assumed to have Markov time dependence, then the nonstationary problem can be reformulated in terms of the problem of classifying stationary time series with known parameters and with known Markov dependence on the states-of-nature. Specific results are presented for two special cases - unknown, time varying a priori class probabilities, and unknown time varying mean.
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Report Availability
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Full text available
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Date Issued
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1968-10
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Provenance
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RAF Centre of Aviation Medicine
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Type
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report
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Format
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1 online resource
AMRLTR67-230.pdf