Background estimation in experimental spectra

Autor:	Kenneth M. Hanson, R. Fischer, W. von der Linden, V. Dose
Rok vydání:	2000
Předmět:	Physics Knot (unit) Smoothness (probability theory) Basis (linear algebra) Statistics Bayesian probability Probabilistic logic Bayesian inference Signal Algorithm Variable (mathematics)
Zdroj:	Physical Review E. 61:1152-1160
ISSN:	1095-3787 1063-651X
Popis:	A general probabilistic technique for estimating background contributions to measured spectra is presented. A Bayesian model is used to capture the defining characteristics of the problem, namely, that the background is smoother than the signal. The signal is allowed to have positive and/or negative components. The background is represented in terms of a cubic spline basis. A variable degree of smoothness of the background is attained by allowing the number of knots and the knot positions to be adaptively chosen on the basis of the data. The fully Bayesian approach taken provides a natural way to handle knot adaptivity and allows uncertainties in the background to be estimated. Our technique is demonstrated on a particle induced x-ray emission spectrum from a geological sample and an Auger spectrum from iron, which contains signals with both positive and negative components.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::462a9c2340957c16d410112a6c1d1b2a https://doi.org/10.1103/physreve.61.1152 Zobrazit plný text záznamu