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  • In practice, for many compositional data sets it will not be possible to apply the outlined statistical methods immediately, and there will be a need for a preprocessing. This is the case in presence of missing values in some compositional parts, but also when zero values occur, which are basically excluded from the definition of compositional data. According to the nature of zero values, rounded and structural zeros need to be considered. Rounded zeros occur when either small values of components are rounded to zeros, or a measurement device has incorporated a detection limit (number) that automatically sets values below this limit to zero. Therefore, their replacement by a small positive value is reasonable. Count zeros are similar to rounded zeros. They result from insufficient sample size from the underlying distribution (mostly from a multinomial distribution) that drives compositions consisting of counts. For the imputation of missing values, rounded and count zeros, model-based algorithms have been developed and are available in R. In contrast, structural zeros are a result of a structural process, and thus imputing them to obtain a full data set is not meaningful. There are several approaches how compositional data with structural zeros can be (indirectly) processed using the logratio methodology. One possibility is to impute structural zeros in an auxiliary step to estimate the overall location and covariance, followed by a statistical analysis in groups of subcompositions according to the zero patterns. (xsd:string)
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  • (SILC) (xsd:string)
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  • EU-SILC-Bibliography (xsd:string)
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  • 2018 (xsd:gyear)
?:datePublished
  • 2018 (xsd:gyear)
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  • 10.1007/978-3-319-96422-5_13 ()
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  • 245 (xsd:string)
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  • english (xsd:string)
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  • 978-3-319-96422-5 ()
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  • Preprocessing Issues (xsd:string)
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  • incollection (xsd:string)
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  • Applied Compositional Data Analysis: With Worked Examples in R (xsd:string)
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  • Bibsonomy (xsd:string)
  • In Applied Compositional Data Analysis: With Worked Examples in R, edited by Filzmoser, Peter and Hron, Karel and Templ, Matthias, 245-272, Springer International Publishing, 2018 (xsd:string)
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  • European Union Statistics on Income and Living Conditions (EU-SILC) (xsd:string)
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  • 2018 (xsd:string)
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  • SILC (xsd:string)
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  • 272 (xsd:string)
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