Adjusting the Clutter model using the Gretl software

Detalhes bibliográficos
Autor(a) principal: Miranda, Rodrigo Otávio Veiga
Data de Publicação: 2017
Outros Autores: Filho, Afonso Figueiredo
Tipo de documento: Artigo
Idioma: por
Título da fonte: Revista de Ciências Agrárias (Belém. Online)
Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605
Resumo: Growth and yield models are essential tools in the planning of forestry companies, in which the Clutter model one of the most used in Brazil. The aim was to demonstrate the necessary steps for the adjustment of the Clutter model by two-stage least square method, using the Gretl software. For this, we employed data from permanent plots in clonal eucalyptus stands, with age from 27 to 78 months. The form of organization of the database and the steps for their import into the software were specified in detail. The required variables to fit the model and the disposition of equation system were also explained. Finally, were commented on the results and their interpretation. The Gretl software represents an effective alternative on adjustment of Clutter model, especially for ease handling and because it has no costs.
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spelling Adjusting the Clutter model using the Gretl softwareAjuste do modelo de Clutter utilizando o programa GretlGrowth and yield models are essential tools in the planning of forestry companies, in which the Clutter model one of the most used in Brazil. The aim was to demonstrate the necessary steps for the adjustment of the Clutter model by two-stage least square method, using the Gretl software. For this, we employed data from permanent plots in clonal eucalyptus stands, with age from 27 to 78 months. The form of organization of the database and the steps for their import into the software were specified in detail. The required variables to fit the model and the disposition of equation system were also explained. Finally, were commented on the results and their interpretation. The Gretl software represents an effective alternative on adjustment of Clutter model, especially for ease handling and because it has no costs.Modelos de crescimento e produção são ferramentas essenciais no planejamento de empresas florestais, sendo o modelo de Clutter um dos mais empregados no Brasil. O objetivo foi demonstrar os passos necessários para o ajuste do modelo de Clutter pelo método dos mínimos quadrados em dois estágios, utilizando o programa Gretl. Para isso, foram empregados dados de parcelas permanentes em povoamentos clonais de eucalipto, com idade variando de 27 a 78 meses. A forma de organização da base de dados e as etapas para sua importação para o programa foram indicadas em detalhes. As variáveis necessárias ao ajuste de modelo e a disposição do sistema de equações também foram explicadas. Finalmente, foram comentados os resultados e sua interpretação. O programa Gretl representa uma alternativa eficaz no ajuste do modelo de Clutter, sobretudo pela facilidade de manuseio e por não possuir custos. Universidade Federal Rural da Amazônia/UFRA2017-05-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 59 No 4 (2016): RCA; 417-421Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 59 n. 4 (2016): RCA; 417-4212177-87601517-591Xreponame:Revista de Ciências Agrárias (Belém. Online)instname:Universidade Federal Rural da Amazônia (UFRA)instacron:UFRAporhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605/898Miranda, Rodrigo Otávio VeigaFilho, Afonso Figueiredoinfo:eu-repo/semantics/openAccess2017-07-13T19:05:54Zoai:ojs.www.periodicos.ufra.edu.br:article/2605Revistahttps://ajaes.ufra.edu.br/index.php/ajaes/PUBhttps://ajaes.ufra.edu.br/index.php/ajaes/oaiallan.lobato@ufra.edu.br || ajaes.suporte@gmail.com2177-87601517-591Xopendoar:2017-07-13T19:05:54Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA)false
dc.title.none.fl_str_mv Adjusting the Clutter model using the Gretl software
Ajuste do modelo de Clutter utilizando o programa Gretl
title Adjusting the Clutter model using the Gretl software
spellingShingle Adjusting the Clutter model using the Gretl software
Miranda, Rodrigo Otávio Veiga
title_short Adjusting the Clutter model using the Gretl software
title_full Adjusting the Clutter model using the Gretl software
title_fullStr Adjusting the Clutter model using the Gretl software
title_full_unstemmed Adjusting the Clutter model using the Gretl software
title_sort Adjusting the Clutter model using the Gretl software
author Miranda, Rodrigo Otávio Veiga
author_facet Miranda, Rodrigo Otávio Veiga
Filho, Afonso Figueiredo
author_role author
author2 Filho, Afonso Figueiredo
author2_role author
dc.contributor.author.fl_str_mv Miranda, Rodrigo Otávio Veiga
Filho, Afonso Figueiredo
description Growth and yield models are essential tools in the planning of forestry companies, in which the Clutter model one of the most used in Brazil. The aim was to demonstrate the necessary steps for the adjustment of the Clutter model by two-stage least square method, using the Gretl software. For this, we employed data from permanent plots in clonal eucalyptus stands, with age from 27 to 78 months. The form of organization of the database and the steps for their import into the software were specified in detail. The required variables to fit the model and the disposition of equation system were also explained. Finally, were commented on the results and their interpretation. The Gretl software represents an effective alternative on adjustment of Clutter model, especially for ease handling and because it has no costs.
publishDate 2017
dc.date.none.fl_str_mv 2017-05-02
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://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605
url https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2605/898
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal Rural da Amazônia/UFRA
publisher.none.fl_str_mv Universidade Federal Rural da Amazônia/UFRA
dc.source.none.fl_str_mv Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 59 No 4 (2016): RCA; 417-421
Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 59 n. 4 (2016): RCA; 417-421
2177-8760
1517-591X
reponame:Revista de Ciências Agrárias (Belém. Online)
instname:Universidade Federal Rural da Amazônia (UFRA)
instacron:UFRA
instname_str Universidade Federal Rural da Amazônia (UFRA)
instacron_str UFRA
institution UFRA
reponame_str Revista de Ciências Agrárias (Belém. Online)
collection Revista de Ciências Agrárias (Belém. Online)
repository.name.fl_str_mv Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA)
repository.mail.fl_str_mv allan.lobato@ufra.edu.br || ajaes.suporte@gmail.com
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