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Significance of var...
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Varmuza, KurtVienna University of Technology, Austria
(author)
Significance of variables for discrimination : Applied to the search of organic ions in mass spectra measured on cometary particles
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-01-25
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Wiley,2018
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:ri-33270
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https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-33270URI
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https://doi.org/10.1002/cem.3001DOI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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The instrument Cometary Secondary Ion Mass Analyzer (COSIMA) on board of the European Space Agency mission Rosetta to the comet 67P/Churyumov-Gerasimenko is a secondary ion mass spectrometer with a time-of-flight mass analyzer. It collected near the comet several thousand particles, imaged them, and analyzed the elemental and chemical compositions of their surfaces. In this study, variables have been generated from the spectral data covering the mass ranges of potential C-, H-, N-, and O-containing ions. The variable importance in binary discriminations between spectra measured on cometary particles and those measured on the target background has been estimated by the univariate t test and the multivariate methods discriminant partial least squares, random forest, and a robust method based on the log ratios of all variable pairs. The results confirm the presence of organic substances in cometary matter-probably a complex macromolecular mixture.
Subject headings and genre
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Classification
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Comet 67P/Churyumov-Gerasimenko
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D-PLS
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Pairwise log ratios
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Random forest
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Rosetta
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Time-of-flight secondary ion mass spectrometry
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Variable importance
Added entries (persons, corporate bodies, meetings, titles ...)
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Filzmoser, PeterVienna University of Technology, Austria
(author)
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Hoffmann, IreneVienna University of Technology, Austria
(author)
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Walach, JanVienna University of Technology, Austria
(author)
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Cottin, HerveUniversité Paris‐Est Créteil et Université Paris, France
(author)
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Fray, NicolasUniversité Paris‐Est Créteil et Université Paris, France
(author)
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Briois, ChristelleUniversité d'Orléans, France
(author)
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Modica, PaolaUniversité d'Orléans, France
(author)
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Bardyn, AnaisCarnegie Institution of Washington, USA
(author)
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Silén, JohanFinnish Meteorological Institute, Finland
(author)
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Siljeström, SandraRISE,Kemi och material(Swepub:ri)SandraSi@ri.se
(author)
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Stenzel, OliverMax-Planck-Institute for Solar System Research, Germany
(author)
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Kissel, JochenMax-Planck-Institute for Solar System Research, Germany
(author)
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Hilchenbach, MartinMax-Planck-Institute for Solar System Research, Germany
(author)
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Vienna University of Technology, AustriaUniversité Paris‐Est Créteil et Université Paris, France
(creator_code:org_t)
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In:Journal of Chemometrics: Wiley32:40886-93831099-128X
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Varmuza, Kurt
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Filzmoser, Peter
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Hoffmann, Irene
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Walach, Jan
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Cottin, Herve
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Fray, Nicolas
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Briois, Christel ...
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Modica, Paola
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Bardyn, Anais
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Silén, Johan
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Siljeström, Sand ...
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Stenzel, Oliver
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Kissel, Jochen
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Hilchenbach, Mar ...
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