Improvements to resampling measures of group support

Autores
Goloboff, Pablo Augusto; Farris, James; Kallersjo, Mari; Oxelman, Bengt; Ramirez, Martin; Szumik, Claudia Adriana
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Several aspects of current resampling methods to assess group support are reviewed. When the characters have different prior weights or some state transformation costs are different, the frequencies under either bootstrapping or jackknifing can be distorted, producing either under‐ or overestimations of the actual group support. This is avoided by symmetric resampling, where the probability p of increasing the weight of a character equals the probability of decreasing it. Problems with interpreting absolute group frequencies as a measure of the support are discussed; group support does not necessarily vary with the frequency itself, since in some cases groups with positive support may have much lower frequencies than groups with no support at all. Three possible solutions for this problem are suggested. The first is measuring the support as the difference in frequency between the group and its most frequent contradictory group. The second is calculating frequencies for values of p below the threshold under which the frequency ranks the groups in the right order of support (this threshold may vary from data set to data set). The third is estimating the support by using the slope of the frequency as a function of different (low) values of p; when p is low, groups with actual support have negative slopes (closer to 0 when the support is higher), and groups with no support have positive slopes (larger when evidence for and against the group is more abundant).
Fil: Goloboff, Pablo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Farris, James. Naturhistoriska Riksmuseet; Suecia
Fil: Kallersjo, Mari. Naturhistoriska Riksmuseet; Suecia
Fil: Oxelman, Bengt. Uppsala Universitet; Suecia
Fil: Ramirez, Martin. American Museum of Natural History; Estados Unidos
Fil: Szumik, Claudia Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Materia
resampling methods
frequency
slope of frequency
abundance
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/101057
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Improvements to resampling measures of group supportGoloboff, Pablo AugustoFarris, JamesKallersjo, MariOxelman, BengtRamirez, MartinSzumik, Claudia Adrianaresampling methodsfrequencyslope of frequencyabundancehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Several aspects of current resampling methods to assess group support are reviewed. When the characters have different prior weights or some state transformation costs are different, the frequencies under either bootstrapping or jackknifing can be distorted, producing either under‐ or overestimations of the actual group support. This is avoided by symmetric resampling, where the probability p of increasing the weight of a character equals the probability of decreasing it. Problems with interpreting absolute group frequencies as a measure of the support are discussed; group support does not necessarily vary with the frequency itself, since in some cases groups with positive support may have much lower frequencies than groups with no support at all. Three possible solutions for this problem are suggested. The first is measuring the support as the difference in frequency between the group and its most frequent contradictory group. The second is calculating frequencies for values of p below the threshold under which the frequency ranks the groups in the right order of support (this threshold may vary from data set to data set). The third is estimating the support by using the slope of the frequency as a function of different (low) values of p; when p is low, groups with actual support have negative slopes (closer to 0 when the support is higher), and groups with no support have positive slopes (larger when evidence for and against the group is more abundant).Fil: Goloboff, Pablo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Farris, James. Naturhistoriska Riksmuseet; SueciaFil: Kallersjo, Mari. Naturhistoriska Riksmuseet; SueciaFil: Oxelman, Bengt. Uppsala Universitet; SueciaFil: Ramirez, Martin. American Museum of Natural History; Estados UnidosFil: Szumik, Claudia Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaWiley Blackwell Publishing, Inc2003-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/101057Goloboff, Pablo Augusto; Farris, James; Kallersjo, Mari; Oxelman, Bengt; Ramirez, Martin; et al.; Improvements to resampling measures of group support; Wiley Blackwell Publishing, Inc; Cladistics; 19; 4; 12-2003; 324-3320748-3007CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0748-3007(03)00060-4info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1096-0031.2003.tb00376.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:49:40Zoai:ri.conicet.gov.ar:11336/101057instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 11:49:40.539CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Improvements to resampling measures of group support
title Improvements to resampling measures of group support
spellingShingle Improvements to resampling measures of group support
Goloboff, Pablo Augusto
resampling methods
frequency
slope of frequency
abundance
title_short Improvements to resampling measures of group support
title_full Improvements to resampling measures of group support
title_fullStr Improvements to resampling measures of group support
title_full_unstemmed Improvements to resampling measures of group support
title_sort Improvements to resampling measures of group support
dc.creator.none.fl_str_mv Goloboff, Pablo Augusto
Farris, James
Kallersjo, Mari
Oxelman, Bengt
Ramirez, Martin
Szumik, Claudia Adriana
author Goloboff, Pablo Augusto
author_facet Goloboff, Pablo Augusto
Farris, James
Kallersjo, Mari
Oxelman, Bengt
Ramirez, Martin
Szumik, Claudia Adriana
author_role author
author2 Farris, James
Kallersjo, Mari
Oxelman, Bengt
Ramirez, Martin
Szumik, Claudia Adriana
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv resampling methods
frequency
slope of frequency
abundance
topic resampling methods
frequency
slope of frequency
abundance
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Several aspects of current resampling methods to assess group support are reviewed. When the characters have different prior weights or some state transformation costs are different, the frequencies under either bootstrapping or jackknifing can be distorted, producing either under‐ or overestimations of the actual group support. This is avoided by symmetric resampling, where the probability p of increasing the weight of a character equals the probability of decreasing it. Problems with interpreting absolute group frequencies as a measure of the support are discussed; group support does not necessarily vary with the frequency itself, since in some cases groups with positive support may have much lower frequencies than groups with no support at all. Three possible solutions for this problem are suggested. The first is measuring the support as the difference in frequency between the group and its most frequent contradictory group. The second is calculating frequencies for values of p below the threshold under which the frequency ranks the groups in the right order of support (this threshold may vary from data set to data set). The third is estimating the support by using the slope of the frequency as a function of different (low) values of p; when p is low, groups with actual support have negative slopes (closer to 0 when the support is higher), and groups with no support have positive slopes (larger when evidence for and against the group is more abundant).
Fil: Goloboff, Pablo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Farris, James. Naturhistoriska Riksmuseet; Suecia
Fil: Kallersjo, Mari. Naturhistoriska Riksmuseet; Suecia
Fil: Oxelman, Bengt. Uppsala Universitet; Suecia
Fil: Ramirez, Martin. American Museum of Natural History; Estados Unidos
Fil: Szumik, Claudia Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
description Several aspects of current resampling methods to assess group support are reviewed. When the characters have different prior weights or some state transformation costs are different, the frequencies under either bootstrapping or jackknifing can be distorted, producing either under‐ or overestimations of the actual group support. This is avoided by symmetric resampling, where the probability p of increasing the weight of a character equals the probability of decreasing it. Problems with interpreting absolute group frequencies as a measure of the support are discussed; group support does not necessarily vary with the frequency itself, since in some cases groups with positive support may have much lower frequencies than groups with no support at all. Three possible solutions for this problem are suggested. The first is measuring the support as the difference in frequency between the group and its most frequent contradictory group. The second is calculating frequencies for values of p below the threshold under which the frequency ranks the groups in the right order of support (this threshold may vary from data set to data set). The third is estimating the support by using the slope of the frequency as a function of different (low) values of p; when p is low, groups with actual support have negative slopes (closer to 0 when the support is higher), and groups with no support have positive slopes (larger when evidence for and against the group is more abundant).
publishDate 2003
dc.date.none.fl_str_mv 2003-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/101057
Goloboff, Pablo Augusto; Farris, James; Kallersjo, Mari; Oxelman, Bengt; Ramirez, Martin; et al.; Improvements to resampling measures of group support; Wiley Blackwell Publishing, Inc; Cladistics; 19; 4; 12-2003; 324-332
0748-3007
CONICET Digital
CONICET
url http://hdl.handle.net/11336/101057
identifier_str_mv Goloboff, Pablo Augusto; Farris, James; Kallersjo, Mari; Oxelman, Bengt; Ramirez, Martin; et al.; Improvements to resampling measures of group support; Wiley Blackwell Publishing, Inc; Cladistics; 19; 4; 12-2003; 324-332
0748-3007
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/S0748-3007(03)00060-4
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1096-0031.2003.tb00376.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.001348

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