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Titolo:
Statistical issues in assessing anthropogenic background for arsenic
Autore:
Portier, KM;
Indirizzi:
Univ Florida, Inst Food & Agr Sci, Dept Stat, Gainesville, FL 32611 USA Univ Florida Gainesville FL USA 32611 ept Stat, Gainesville, FL 32611 USA
Titolo Testata:
ENVIRONMENTAL FORENSICS
fascicolo: 2, volume: 2, anno: 2001,
pagine: 155 - 160
SICI:
1527-5922(200106)2:2<155:SIIAAB>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Keywords:
mixture of distributions; natural background concentrations; probability density estimation; probabilistic risk assessment; EM algorithm; maximum likelihood estimation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Portier, KM Univ Florida, Inst Food & Agr Sci, Dept Stat, Gainesville, FL 32611 USA Univ Florida Gainesville FL USA 32611 inesville, FL 32611 USA
Citazione:
K.M. Portier, "Statistical issues in assessing anthropogenic background for arsenic", ENVIRON FOR, 2(2), 2001, pp. 155-160

Abstract

Conceptual and statistical issues surrounding the estimation of a background concentration distribution for arsenic are reviewed. How background areais defined and samples collected are shown to impact the shape and location of the probability density function that in turn affects the estimation and precision of associated distributional parameters. The overall background concentration distribution is conceptualized as a mixture of a natural background distribution, an anthropogenic background distribution and a distribution designed to accommodate the potential for contamination site samples being included into the background sample set. This concept is extended to a discussion of issues surrounding estimation of natural and anthropogenic background distributions for larger geographic areas. Finally, the mixture model is formally defined and statistical approaches to estimating its parameters discussed. (C) 2001 AEHS.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 03:44:42