On the distribution of proportions and ratios as indicators of ungulate body condition

Detalhes bibliográficos
Autor(a) principal: Alpizar-Jara, R.
Data de Publicação: 2007
Outros Autores: Quintino, H., Serrano, E.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/6597
Resumo: In the wildlife literature various studies have shown that the amount of fat around the kidneys is often a good indicator of body condition and health of ungulate species ([1],[2]). Wildlife biologies often measure the weights of fat around the kidneys and the kidneys themselves (without fat), comparing these two quantities and transforming them into a ratio or a proportion as surrogates of body condition of dead animals. Later, they use these indices as response variables to model the e®ect of covariates or treatments, such as age group and season of the year, on body condition. The more commonly used models are ANOVA-type. Most debate has been concentrated on whether or not to use a simple ANOVA model of ratios or proportions with ¯xed e®ects, or an ANCOVA model using fat weight as response variable, and the kidneys weight as a covariate ([3]). Results have taken by surprise some biologists because using one or another model with both response variables could lead to very di®erent results for what it considered the most important e®ects. In this manuscript we attempt to highlight the main di®erences and the distributional properties of these response variables, ratio and proportion.
id RCAP_0038d1eb77ce75e13baaa0575c05d3d7
oai_identifier_str oai:dspace.uevora.pt:10174/6597
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling On the distribution of proportions and ratios as indicators of ungulate body conditionProbability distributionsRatiosProportionsIn the wildlife literature various studies have shown that the amount of fat around the kidneys is often a good indicator of body condition and health of ungulate species ([1],[2]). Wildlife biologies often measure the weights of fat around the kidneys and the kidneys themselves (without fat), comparing these two quantities and transforming them into a ratio or a proportion as surrogates of body condition of dead animals. Later, they use these indices as response variables to model the e®ect of covariates or treatments, such as age group and season of the year, on body condition. The more commonly used models are ANOVA-type. Most debate has been concentrated on whether or not to use a simple ANOVA model of ratios or proportions with ¯xed e®ects, or an ANCOVA model using fat weight as response variable, and the kidneys weight as a covariate ([3]). Results have taken by surprise some biologists because using one or another model with both response variables could lead to very di®erent results for what it considered the most important e®ects. In this manuscript we attempt to highlight the main di®erences and the distributional properties of these response variables, ratio and proportion.ISI2012-12-07T12:46:36Z2012-12-072007-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/6597http://hdl.handle.net/10174/6597engAlpizar-Jara, R., Quintino, H. & Serrano, E. (2007). On the distribution of proportions and ratios as indicators of ungulate body condition. Bulletin of the International Statistical Institute. Proceedings of 56th Session, ISI 2007, Lisboa, 4 p. (electronic publication).9789073592001http://www.isi-web.org/publications/proceedingsalpizar@uevora.ptndnd336Alpizar-Jara, R.Quintino, H.Serrano, E.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:46:15Zoai:dspace.uevora.pt:10174/6597Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:01:23.449049Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv On the distribution of proportions and ratios as indicators of ungulate body condition
title On the distribution of proportions and ratios as indicators of ungulate body condition
spellingShingle On the distribution of proportions and ratios as indicators of ungulate body condition
Alpizar-Jara, R.
Probability distributions
Ratios
Proportions
title_short On the distribution of proportions and ratios as indicators of ungulate body condition
title_full On the distribution of proportions and ratios as indicators of ungulate body condition
title_fullStr On the distribution of proportions and ratios as indicators of ungulate body condition
title_full_unstemmed On the distribution of proportions and ratios as indicators of ungulate body condition
title_sort On the distribution of proportions and ratios as indicators of ungulate body condition
author Alpizar-Jara, R.
author_facet Alpizar-Jara, R.
Quintino, H.
Serrano, E.
author_role author
author2 Quintino, H.
Serrano, E.
author2_role author
author
dc.contributor.author.fl_str_mv Alpizar-Jara, R.
Quintino, H.
Serrano, E.
dc.subject.por.fl_str_mv Probability distributions
Ratios
Proportions
topic Probability distributions
Ratios
Proportions
description In the wildlife literature various studies have shown that the amount of fat around the kidneys is often a good indicator of body condition and health of ungulate species ([1],[2]). Wildlife biologies often measure the weights of fat around the kidneys and the kidneys themselves (without fat), comparing these two quantities and transforming them into a ratio or a proportion as surrogates of body condition of dead animals. Later, they use these indices as response variables to model the e®ect of covariates or treatments, such as age group and season of the year, on body condition. The more commonly used models are ANOVA-type. Most debate has been concentrated on whether or not to use a simple ANOVA model of ratios or proportions with ¯xed e®ects, or an ANCOVA model using fat weight as response variable, and the kidneys weight as a covariate ([3]). Results have taken by surprise some biologists because using one or another model with both response variables could lead to very di®erent results for what it considered the most important e®ects. In this manuscript we attempt to highlight the main di®erences and the distributional properties of these response variables, ratio and proportion.
publishDate 2007
dc.date.none.fl_str_mv 2007-01-01T00:00:00Z
2012-12-07T12:46:36Z
2012-12-07
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/6597
http://hdl.handle.net/10174/6597
url http://hdl.handle.net/10174/6597
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Alpizar-Jara, R., Quintino, H. & Serrano, E. (2007). On the distribution of proportions and ratios as indicators of ungulate body condition. Bulletin of the International Statistical Institute. Proceedings of 56th Session, ISI 2007, Lisboa, 4 p. (electronic publication).
9789073592001
http://www.isi-web.org/publications/proceedings
alpizar@uevora.pt
nd
nd
336
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv ISI
publisher.none.fl_str_mv ISI
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799136497365942272