The importance of the experimental error

Detalhes bibliográficos
Autor(a) principal: Nesi, Cristiano Nunes
Data de Publicação: 2021
Outros Autores: de Bettio, Stéfani
Tipo de documento: Artigo
Idioma: por
Título da fonte: Agropecuária Catarinense (Online)
Texto Completo: https://publicacoes.epagri.sc.gov.br/rac/article/view/920
Resumo: The statistical analysis is used to test hypotheses due to the presence of the effects of not controlledfactors that cause variation, called experimental error. These effects are randomized among the units that received treatments, they cannot be known individually and they have direct interference in the tests of hypotheses and in the procedures for comparisons of means. The objective of this review is to discuss the importance of theexperimental error in F test and least significant difference (LSD) used in the procedures of multiple comparisons of means, using as example a competition assay of common beans cultivars. LSD increases with the increase of the mean square residues. When the coefficient of variation increases from 5% to 20%, LSD increases four timesin the tests of Scheffé and Tukey and five times for Dunnett and Duncan tests. For a coefficient of variation of 20%, LSD is greater than 50% of the mean of cultivars for Scheffé and Tukey tests. With a coefficient of variation of 35% the LSD between two treatments is higher than the mean experiment when the Scheffé test is used.
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spelling The importance of the experimental errorA importância do erro experimentalvariação ambientaldiferença mínima significativa.environmental variationleast significant differenceThe statistical analysis is used to test hypotheses due to the presence of the effects of not controlledfactors that cause variation, called experimental error. These effects are randomized among the units that received treatments, they cannot be known individually and they have direct interference in the tests of hypotheses and in the procedures for comparisons of means. The objective of this review is to discuss the importance of theexperimental error in F test and least significant difference (LSD) used in the procedures of multiple comparisons of means, using as example a competition assay of common beans cultivars. LSD increases with the increase of the mean square residues. When the coefficient of variation increases from 5% to 20%, LSD increases four timesin the tests of Scheffé and Tukey and five times for Dunnett and Duncan tests. For a coefficient of variation of 20%, LSD is greater than 50% of the mean of cultivars for Scheffé and Tukey tests. With a coefficient of variation of 35% the LSD between two treatments is higher than the mean experiment when the Scheffé test is used. O erro experimental resulta dos efeitos de fatores não controlados que causam variação e ocorrem de forma aleatória entre as unidades que receberam os tratamentos, não pode ser conhecido individualmente e tem interferência nos testes de hipóteses e nos procedimentos para comparações de médias. O objetivo dessa revisão é discutir a importância do erro experimental no teste F e na diferença mínima significativa (DMS) utilizada nos procedimentos de comparações múltiplas de médias, exemplificando com um ensaio de competição de cultivares de feijoeiro. A DMS se eleva quando há aumento no quadrado médio do resíduo. Para o exemplo, quando o coeficiente de variação aumenta de 5% para 20%, a DMS aumenta em quatro vezes nos testes de Scheffé e Tukeye cinco para Dunnett e Duncan. Para um coeficiente de variação de 20%, a DMS é mais de 50% da média das cultivares para os testes de Scheffé e Tukey. Observa-se uma DMS entre dois tratamentos maior que a média do experimento com um coeficiente de variação de 35% utilizando-se o teste de Scheffé. Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri2021-05-27info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://publicacoes.epagri.sc.gov.br/rac/article/view/920Agropecuária Catarinense Journal; Vol. 19 No. 1 (2006); 78-81Agropecuária Catarinense; v. 19 n. 1 (2006); 78-812525-60760103-0779reponame:Agropecuária Catarinense (Online)instname:Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)instacron:EPAGRIporhttps://publicacoes.epagri.sc.gov.br/rac/article/view/920/822Copyright (c) 2006 Agropecuaria catarinensehttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessNesi, Cristiano Nunesde Bettio, Stéfani 2021-05-27T12:41:37Zoai:ojs.publicacoes.epagri.sc.gov.br:article/920Revistahttps://publicacoes.epagri.sc.gov.br/RAC/indexPUBhttps://publicacoes.epagri.sc.gov.br/index.php/RAC/oaieditoriarac@epagri.sc.gov.br || lamperuch@epagri.sc.gov.br2525-60760103-0779opendoar:2021-05-27T12:41:37Agropecuária Catarinense (Online) - Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)false
dc.title.none.fl_str_mv The importance of the experimental error
A importância do erro experimental
title The importance of the experimental error
spellingShingle The importance of the experimental error
Nesi, Cristiano Nunes
variação ambiental
diferença mínima significativa.
environmental variation
least significant difference
title_short The importance of the experimental error
title_full The importance of the experimental error
title_fullStr The importance of the experimental error
title_full_unstemmed The importance of the experimental error
title_sort The importance of the experimental error
author Nesi, Cristiano Nunes
author_facet Nesi, Cristiano Nunes
de Bettio, Stéfani
author_role author
author2 de Bettio, Stéfani
author2_role author
dc.contributor.author.fl_str_mv Nesi, Cristiano Nunes
de Bettio, Stéfani
dc.subject.por.fl_str_mv variação ambiental
diferença mínima significativa.
environmental variation
least significant difference
topic variação ambiental
diferença mínima significativa.
environmental variation
least significant difference
description The statistical analysis is used to test hypotheses due to the presence of the effects of not controlledfactors that cause variation, called experimental error. These effects are randomized among the units that received treatments, they cannot be known individually and they have direct interference in the tests of hypotheses and in the procedures for comparisons of means. The objective of this review is to discuss the importance of theexperimental error in F test and least significant difference (LSD) used in the procedures of multiple comparisons of means, using as example a competition assay of common beans cultivars. LSD increases with the increase of the mean square residues. When the coefficient of variation increases from 5% to 20%, LSD increases four timesin the tests of Scheffé and Tukey and five times for Dunnett and Duncan tests. For a coefficient of variation of 20%, LSD is greater than 50% of the mean of cultivars for Scheffé and Tukey tests. With a coefficient of variation of 35% the LSD between two treatments is higher than the mean experiment when the Scheffé test is used.
publishDate 2021
dc.date.none.fl_str_mv 2021-05-27
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://publicacoes.epagri.sc.gov.br/rac/article/view/920
url https://publicacoes.epagri.sc.gov.br/rac/article/view/920
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://publicacoes.epagri.sc.gov.br/rac/article/view/920/822
dc.rights.driver.fl_str_mv Copyright (c) 2006 Agropecuaria catarinense
https://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2006 Agropecuaria catarinense
https://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri
publisher.none.fl_str_mv Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri
dc.source.none.fl_str_mv Agropecuária Catarinense Journal; Vol. 19 No. 1 (2006); 78-81
Agropecuária Catarinense; v. 19 n. 1 (2006); 78-81
2525-6076
0103-0779
reponame:Agropecuária Catarinense (Online)
instname:Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)
instacron:EPAGRI
instname_str Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)
instacron_str EPAGRI
institution EPAGRI
reponame_str Agropecuária Catarinense (Online)
collection Agropecuária Catarinense (Online)
repository.name.fl_str_mv Agropecuária Catarinense (Online) - Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri)
repository.mail.fl_str_mv editoriarac@epagri.sc.gov.br || lamperuch@epagri.sc.gov.br
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