International Workshop on Compositional Data Analysis (CoDaWork)
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Robust compositional data analysis
(2011)
Conference report
Open AccessMany practical data sets contain outliers or other forms of data inhomogeneities. Robust statistics offers concepts how to deal with these situations where the data do not follow strict model assumptions. These concepts ... -
Compositional data, bayesian inference and the modeling process
(2011)
Conference report
Open AccessStatistical modeling in practice encompasses both the exploratory process, which is an inductive scientific approach and the confirmatory modeling process, which uses the deductive scientific approach. This paper will ... -
Self-consistent modelling of Mercury’s surface composition and exosphere by solar wind sputtering
(2011)
Conference report
Open AccessA Monte-Carlo model of exospheres was extended by treating the solar wind ion induced sputtering process, quantitatively in a self-consistent way starting with the actual release of particles from the mineral surface of ... -
Compositional data analysis with Red-R
(2011)
Conference report
Open AccessThe compositional analyst must use a series of software to transform raw compositional data and run statistical analyses on them. Tools for compositional data analysis are available in R, an open source widely-used ... -
Compositions and fuzzy compositions in decision-making models
(2011)
Conference report
Open AccessIn decision-making models, the compositions (Aitchison, 1986) are employed in various forms. They can represent the normalized weights of criteria in multiple-criteria decision-making models, or the probabilities of ... -
Compositional analysis of phosphorus pools in Canadian Mollisols
(2011)
Conference report
Open AccessDuring cultivation, the internal phosphorus cycle of Mollisols (Chernozems) of the Canadian Prairies is perturbed by crop sequences including wheat phases, tillage practices, and regular applications of fertilizers. To ... -
Unmixing compositional data with Bayesian techniques
(2011)
Conference report
Open AccessA general problem in compositional data analysis is the unmixing of a composition into a series of pure endmembers. In its most complex version, one does neither know the composition of these endmembers, nor their relative ... -
Principal balances
(2011)
Conference report
Open AccessPrincipal balances are de ned as a sequence of orthonormal balances which maximize successively the explained variance in a data set. Apparently, computing principal balances requires an exhaustive search along all ... -
Approaching predator-prey Lotka-Volterra equations by simplicial linear differential equations
(2011)
Conference report
Open AccessPredator-prey Lotka-Volterra equations was one of the rst models reflecting interaction of different species and modeling evolution of respective populations. It considers a large population of hares (preys) which is ... -
Statistical inference for Hardy-Weinberg equilibrium using log-ratio coordinates
(2011)
Conference report
Open AccessTesting markers for Hardy-Weinberg equilibrium (HWE) is an important step in the analysis of large databases used in genetic association studies. Gross deviation from HWE can be indicative of genotyping error. There are ... -
Phytoplankton composition in shallow water ecosystems: influence of environmental gradients and nutrient availability
(2011)
Conference report
Open AccessEnvironmental gradients caused by hydrological changes, whether natural or maninduced, affect the planktonic taxonomic and functional composition in shallow water ecosystems. In this sense, our aim was to find out the ... -
Application of compositional models for glycan HILIC data
(2011)
Conference report
Open AccessGlycoconjugates constitute a major class of biomolecules which include glycoproteins, glycosphingolipids and proteoglycans. The enzymatic process in which glycans (sugar chains) are linked to proteins or lipids is called ...
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