About: Model-based replacement of rounded zeros in compositional data: Classical and robust approaches

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The log-ratio methodology represents a powerful set of methods and techniques for statistical analysis of compositional data. These techniques may be used for the estimation of rounded zeros or values below the detection limit in cases when the underlying data are compositional in nature. An algorithm based on iterative log-ratio regressions is developed by combining a particular family of isometric log-ratio transformations with censored regression. In the context of classical regression methods, the equivalence of the method based on additive and isometric log-ratio transformations is proved. This equivalence does not hold for robust regression. Based on Monte Carlo methods, simulations are performed to assess the performance of classical and robust methods. To illustrate the method, a case study involving geochemical data is conducted. The log-ratio methodology represents a powerful set of methods and techniques for statistical analysis of compositional data. These techniques may be used for the estimation of rounded zeros or values below the detection limit in cases when the underlying data are compositional in nature. An algorithm based on iterative log-ratio regressions is developed by combining a particular family of isometric log-ratio transformations with censored regression. In the context of classical regression methods, the equivalence of the method based on additive and isometric log-ratio transformations is proved. This equivalence does not hold for robust regression. Based on Monte Carlo methods, simulations are performed to assess the performance of classical and robust methods. To illustrate the method, a case study involving geochemical data is conducted. (en)
Title	Model-based replacement of rounded zeros in compositional data: Classical and robust approaches Model-based replacement of rounded zeros in compositional data: Classical and robust approaches (en)
skos:prefLabel	Model-based replacement of rounded zeros in compositional data: Classical and robust approaches Model-based replacement of rounded zeros in compositional data: Classical and robust approaches (en)
skos:notation	RIV/61989592:15310/12:33141584!RIV13-MSM-15310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	S
http://linked.open...avai/riv/aktivity	S
http://linked.open...iv/cisloPeriodika	9
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Hron, Karel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	150965
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/12:33141584
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Balances, EM algorithm, Log-ratio transformations, Robust regression, Values below detection limit (en)
http://linked.open.../riv/klicoveSlovo	Log-ratio transformations Balances Robust regression Values below detection limit EM algorithm
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[DC7FF815A5A5]
http://linked.open...i/riv/nazevZdroje	Computational Statistics and Data Analysis
http://linked.open...in/vavai/riv/obor	BB
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	56
http://linked.open...iv/tvurceVysledku	Hron, Karel Filzmoser, Peter Templ, Matthias Martín-Fernández, Josep Antoni Palarea-Albaladejo, Javier
http://linked.open...ain/vavai/riv/wos	000304073600007
issn	0167-9473
number of pages	17 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.csda.2012.02.012
http://localhost/t...ganizacniJednotka	15310
is http://linked.open...avai/riv/vysledek of	Model-based replacement of rounded zeros in compositional data: Classical and robust approaches

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