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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
25/04/2011 |
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Data da última atualização: |
08/07/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
VIEIRA, S. R.; CARVALHO, J. R. P. de; PAZ GONZÁLEZ, A. |
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Afiliação: |
SIDNEY ROSA VIEIRA, IAC; JOSE RUY PORTO DE CARVALHO, CNPTIA; ANTONIO PAZ GONZÁLEZ, Universidade da Coruña, Espanha. |
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Título: |
Jack knifing for semivariogram validation. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Bragantia, Campinas, v. 69, p. 97-105, 2010 |
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Idioma: |
Inglês |
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Notas: |
Suplemento. |
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Conteúdo: |
The semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to choose a better fit in distinct regions of the semivariogram. MenosThe semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to c... Mostrar Tudo |
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Palavras-Chave: |
Erro reduzido; Estacionaridade; Semivariograms; Stationarity. |
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Thesagro: |
Topografia. |
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Thesaurus Nal: |
Topography. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/33101/1/Jack2.pdf
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Marc: |
LEADER 02167naa a2200229 a 4500
001 1886773
005 2011-07-08
008 2010 bl uuuu u00u1 u #d
100 1 $aVIEIRA, S. R.
245 $aJack knifing for semivariogram validation.$h[electronic resource]
260 $c2010
500 $aSuplemento.
520 $aThe semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to choose a better fit in distinct regions of the semivariogram.
650 $aTopography
650 $aTopografia
653 $aErro reduzido
653 $aEstacionaridade
653 $aSemivariograms
653 $aStationarity
700 1 $aCARVALHO, J. R. P. de
700 1 $aPAZ GONZÁLEZ, A.
773 $tBragantia, Campinas$gv. 69, p. 97-105, 2010
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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| Registros recuperados : 32 | |
| 22. |  | SILVA, L. G. C.; VIANA, F. M. P.; CAMARA, M. P. S.; LIMA, J. S.; LIMA, F. A. Growth and sporulation of Colletotrichum gloeosporioides in different culture media. In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 43., Cuiabá, 2010. Tropical Plant Pathology, Lavras, v. 35 (Suplemento), p. S140, 2010. Brasília: Sociedade Brasileira de Fitopatologia, 2010.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 25. | | VIANA, F. M. P.; HOLANDA, V. O. de; ANJOS, R. M. dos; CARDOSO, J. E.; LIMA, F. A. Sensitivity of melon pathogenic fungus to resistance inductors. In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 43., Cuiabá, 2010. Tropical Plant Pathology, Lavras, v. 35 (Suplemento), p. S8, 2010. Brasília: Sociedade Brasileira de Fitopatologia, 2010.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 26. | | LIMA, F. A. M.; FIGUEIREDO, E. A. P. de; SIMPLICIO, A. A.; PONCE DE LEON, F. A. Traditional system of goat management. I. Pre-weaning growth performance of the SRD (NON-DESCRIPT) goats. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 18, n. 5, p. 557-563, maio, 1983.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Caprinos e Ovinos; Embrapa Unidades Centrais. |
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| 27. | | LIMA, J. S.; CARDOSO, J. E.; MOREIRA, R. C.; ALVES, E. S.; LIMA, F. A.; ANJOS, R. M. dos; VIANA, F. M. P. Crescimento micelial e esporulação de isolados de Lasiodiplodia theobromae em substratos vegetais. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 21., 2010, Natal. Anais... Natal: Sociedade Brasileira de Fruticultura, 2010. PEN-DRIVE| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 28. | | CARDOSO, J. E.; SILVA, J. L.; MARTINS, M. V. V.; MOREIRA, R. C.; VIANA, F. M. P.; CHAVES, L. G.; ALVES, E. S.; LIMA, F. A.; VIDAL, D. Ocorrência e controle químico da antracnose em plantio comercial da romãzeira no Estado do Ceará. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 21., 2010, Natal. Anais... Natal: Sociedade Brasileira de Fruticultura, 2010. PEN DRIVE| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 29. | | MARTINS, P. A.; TROBO-MASEDA, L.; LIMA, F. A.; MORAIS JÚNIOR, W. G. DE; MARCO, J. LISBOA DE; SALUM, T. F. C.; GUISAN, J. M. Omega-3 production by fish oil hydrolysis using a lipase from Burkholderia gladioli BRM58833 immobilized and stabilized by post-immobilization techniques. Biochemistry and Biophysics Reports, v. 29, 101193, 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 3 |
| Biblioteca(s): Embrapa Agroenergia. |
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| 30. | | SILVA, L. G. C. da; VIANA, F. M. P.; CÂMARA, M. P. S.; CAVALCANTI, J. J. V.; CARDOSO, J. E.; MELO, J. G. M.; ALVES, E. S.; LIMA, F. A. Reação de clones de cajueiro a isolados de Colletotrichum sp. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 21., 2010, Natal. Anais... Natal: Sociedade Brasileira de Fruticultura, 2010.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 31. | | HOLANDA, D. K. R.; WURLITZER, N. J.; DIONISIO, A. P.; CAMPOS, A. R.; BRITO, E. S. de; SILVA, L. M. A. e; RIBEIRO, P. R. V.; COSTA, A. M.; SOUZA, P. H. M.; LIMA. F. A. V.; MOREIRA, R. de A. Passiflora tenuifila Killip: Assessment of chemical composition by 1H NMR and UPLC-ESI-Q-TOF-MSE and its bioactive properties in a rotenone-induced rat model of Parkinson's disease. Journal of Functional Foods, v. 62, art. 103529, 2019. 9 p.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Agroindústria Tropical; Embrapa Cerrados. |
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| 32. | | HOLANDA, D. K. R.; WURLITZER, N. J.; DIONISIO, A. P.; BARROS, A. R. C.; BRITO, E. S. de; SILVA, L. M. A. e; RIBEIRO, P. R. V.; COSTA, A. M.; SOUZA, P. H. M. DE; LIMA, F. A. V.; MOREIRA, R. DE A. Passiflora tenuifila Killip: assessment of chemical composition by ¹H NMR and UPLC-ESI-Q-TOF-MSe and its bioactive properties in a rotenone-induced rat model of Parkinson's disease. Journal of Functional Foods, Amsterdam, v. 62, artigo 103529, p. 1-9, Nov. 2019.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| Registros recuperados : 32 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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