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Insights into the influence of priors in posterior mapping of discrete morphological characters: a case study in annonaceae

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dc.creatorCouvreur, Thomas L. P.spa
dc.creatorGort, Gerritspa
dc.creatorRichardson, James-Edwardspa
dc.creatorSosef, Marc S. M.spa
dc.creatorChatrou, Lars W.spa
dc.date.accessioned2020-08-19T14:44:25Z
dc.date.available2020-08-19T14:44:25Z
dc.date.created2010-05-10spa
dc.description.abstractBackground Posterior mapping is an increasingly popular hierarchical Bayesian based method used to infer character histories and reconstruct ancestral states at nodes of molecular phylogenies, notably of morphological characters. As for all Bayesian analyses specification of prior values is an integrative and important part of the analysis. He we provide an example of how alternative prior choices can seriously influence results and mislead interpretations. Methods/Principal Findings For two contrasting discrete morphological characters, namely a slow and a fast evolving character found in the plant family Annonaceae, we specified a total of eight different prior distributions per character. We investigated how these prior settings affected important summary statistics. Our analyses showed that the different prior distributions had marked effects on the results in terms of average number of character state changes. These differences arise because priors play a crucial role in determining which areas of parameter space the values of the simulation will be drawn from, independent of the data at hand. However, priors seemed to fit the data better if they would result in a more even sampling of parameter space (normal posterior distribution), in which case alternative standard deviation values had little effect on the results. The most probable character history for each character was affected differently by the prior. For the slower evolving character, the same character history always had the highest posterior probability independent of the priors used. In contrast, the faster evolving character showed different most probable character histories depending on the prior. These differences could be related to the level of homoplasy exhibited by each character. Conclusions Although our analyses were restricted to two morphological characters within a single family, our results underline the importance of carefully choosing prior values for posterior mapping. Prior specification will be of crucial importance when interpreting the results in a meaningful way. It is hard to suggest a statistically sound method for prior specification without more detailed studies. Meanwhile, we propose that the data could be used to estimate the prior value of the gamma distribution placed on the transformation rate in posterior mapping.eng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1371/journal.pone.0010473
dc.identifier.issnEISSN: 1932-6203
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/27882
dc.language.isoengspa
dc.publisherPLOS Public Library of Sciencespa
dc.relation.citationIssueNo. 5
dc.relation.citationStartPageE10473
dc.relation.citationTitlePLoS One
dc.relation.citationVolumeVol. 5
dc.relation.ispartofPLoS One, EISSN: 1932-6203, Vol.5, No.5 (May 2010); pp. E10473spa
dc.relation.urihttps://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0010473&type=printablespa
dc.rights.accesRightsinfo:eu-repo/semantics/openAccess
dc.rights.accesoAbierto (Texto Completo)spa
dc.sourcePLoS Onespa
dc.source.instnameinstname:Universidad del Rosario
dc.source.reponamereponame:Repositorio Institucional EdocUR
dc.subject.keywordPollenspa
dc.subject.keywordCarpelsspa
dc.subject.keywordProbability distributionspa
dc.subject.keywordPhylogenetic analysisspa
dc.subject.keywordPhylogeneticsspa
dc.subject.keywordProbability densityspa
dc.subject.keywordGraphsspa
dc.subject.keywordStatistical distributionsspa
dc.titleInsights into the influence of priors in posterior mapping of discrete morphological characters: a case study in annonaceaespa
dc.title.TranslatedTitlePerspectivas sobre la influencia de los antecedentes en el mapeo posterior de caracteres morfológicos discretos: un estudio de caso en annonaceaespa
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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