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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
25/04/1995 |
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Data da última atualização: |
04/04/2017 |
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Autoria: |
EBERHARDT, L. L.; GILBERT, R. O.; HOLLISTER, H. L.; THOMAS, J. M. |
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Título: |
Sampling for contaminants in ecological systems. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Environmental Science Technology, v.10, n.9, p.917-925, 1976. |
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Idioma: |
Inglês |
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Conteúdo: |
A framework for designing schemes to sample for contaminants requires a clear statement of objectives, selection of an appropriate model and error system and should yield cost-effective ways to sample to meet specfific objectives. After reviewing five classes of models that might be used in studies of contaminants, we conclude that a universal model is prestently of reach, but that existing systems will serve various practial purposes. A rationale for choice of error structure leads to such frequency distribution as the gamma and log-normal; therefore, we have devised ways of testing the major assumption involved - that of constancy of the coefficient of variation. The above framework yields a revised optimum allocation and sample-size formula. Our study of models leads to recommending the use of body size (lenght, weight) as an auxiliary variable in sampling for either estimation (double sampling) or comparisons (analysis of covariance). A technique now used in industrial experimentations is recomended for sampling for model building (or model fitting) and it is suggested that techniques in use in economic geology also be considered for adaptation. |
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Palavras-Chave: |
Amostra; Contamination; Environments; Sample. |
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Thesagro: |
Contaminação; Ecologia; Meio Ambiente. |
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Thesaurus Nal: |
ecology. |
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Categoria do assunto: |
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Marc: |
LEADER 01814naa a2200253 a 4500
001 1784138
005 2017-04-04
008 1976 bl --- 0-- u #d
100 1 $aEBERHARDT, L. L.
245 $aSampling for contaminants in ecological systems.
260 $c1976
520 $aA framework for designing schemes to sample for contaminants requires a clear statement of objectives, selection of an appropriate model and error system and should yield cost-effective ways to sample to meet specfific objectives. After reviewing five classes of models that might be used in studies of contaminants, we conclude that a universal model is prestently of reach, but that existing systems will serve various practial purposes. A rationale for choice of error structure leads to such frequency distribution as the gamma and log-normal; therefore, we have devised ways of testing the major assumption involved - that of constancy of the coefficient of variation. The above framework yields a revised optimum allocation and sample-size formula. Our study of models leads to recommending the use of body size (lenght, weight) as an auxiliary variable in sampling for either estimation (double sampling) or comparisons (analysis of covariance). A technique now used in industrial experimentations is recomended for sampling for model building (or model fitting) and it is suggested that techniques in use in economic geology also be considered for adaptation.
650 $aecology
650 $aContaminação
650 $aEcologia
650 $aMeio Ambiente
653 $aAmostra
653 $aContamination
653 $aEnvironments
653 $aSample
700 1 $aGILBERT, R. O.
700 1 $aHOLLISTER, H. L.
700 1 $aTHOMAS, J. M.
773 $tEnvironmental Science Technology$gv.10, n.9, p.917-925, 1976.
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Registro original: |
Embrapa Pantanal (CPAP) |
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