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Title: A cross-validation procedure for stopping the EM algorithm and deconvolution of neutron depth profiling spectra

The iterative EM algorithm is used to deconvolve neutron depth profiling spectra. Because of statistical noise in the data, artifacts in the estimated particle emission rate profile appear after too many iterations of the EM algorithm. To avoid artifacts, the EM algorithm is stopped using a cross-validation procedure. The data are split into two independent halves. The EM algorithm is applied to one half of the data to get an estimate of the emission rates. The algorithm is stopped when the conditional likelihood of the other half of the data passes through its maximum. The roles of the two halves of the data are then switched to get a second estimate of the emission rates. The two estimates are then averaged.
Authors:
 [1]
  1. (National Inst. of Standards and Technology, Statistical Engineering Div., Gaithersburg, MD (US))
Publication Date:
OSTI Identifier:
5806395
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA); Journal Volume: 38:1
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; NEUTRON SPECTRA; ALGORITHMS; ITERATIVE METHODS; NEUTRON EMISSION; EMISSION; MATHEMATICAL LOGIC; SPECTRA 440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation; 990200 -- Mathematics & Computers