4th International Workshop on Compositional Data Analysis (CODAWORK 2011), Sant Feliu de Guíxols, 15 juny, 2011
Proceedings of the 4th International Workshop on Compositional Data Analysis
Held in Sant Feliu de Guíxols, Spain, 15 June 2011
A publication of:
International Center for Numerical Methods in Engineering (CIMNE) Barcelona, Spain
J.J. Egozcue; R. Tolosana Delgado; M.I. Ortego (Eds.)
© The authors
Summary

Evidence information in Bayesian updating
(201106)
Other
Open AccessBayes theorem (discrete case) is taken as a paradigm of information acquisition. As mentioned by Aitchison, Bayes formula can be identiﬁed with perturbation of a prior probability vector and a discrete likelihood function, ... 
Classical and robust imputation of missing values for compositional data using balances
(2011)
Conference report
Open Access 
Modeling composition of CaFeMg carbonates in a natural CO2 reservoir
(2011)
Conference report
Open AccessUnderstanding the physicalchemical features of liquid, gas and solid phases in natural analogue reservoirs of Carbon Capture and Sequestration (CCS) site is fundamental as they can provide key data for building up both ... 
Source apportionment of atmospheric trace gases and particulate matter: comparison of logratio and traditional approaches
(2011)
Conference report
Open AccessIn this paper we compare multivariate methods using both traditional approaches, which ignore issues of closure and provide relatively simple methods to deal with censored or missing data, and logratio methods to determine ... 
Fractal and compositional analysis of soil aggregation
(2011)
Conference report
Open AccessA soil aggregate is made of closely packed sand, silt, clay, and organic particles building up soil structure. Soil aggregation is a soil quality index integrating the chemical, physical, and biological processes ... 
Compositional metaanalysis of citrus varieties in the state of São Paulo, Brazil
(2011)
Conference report
Open AccessBrazil is the largest orange (Citrus sinensis) producer worldwide. The nutrient management of orange orchards is designed from experiments on a limited number of varieties. This knowledge is transferred to other varieties ... 
Compositional metaanalysis of the nutrient profile of potato cultivars
(2011)
Conference report
Open AccessWhile several potato (Solanum tuberosum L.) cultivars of different maturity groups (e.g. early, midseason, late) are being selected each year as a result of successful breeding for disease resistance and market requirements, ... 
A databased power transformation for compositional data
(2011)
Conference report
Open AccessA compositional data vector is a special type of multivariate observation in which the elements of the vector are nonnegative and sum to a constant, usually taken to be unity. Data of this type arise in many elds ... 
Multivariate association of compositional data matrices with applications in comparing hyperspectral images
(2011)
Conference report
Open AccessIt is wellknown in image processing that, by varying the wavelength, any material reflects and absorbs in a different way the solar radiation. This is registered by hyperspectral sensors, which collect multivariate ... 
Ordinary cokriging of additive logratios for estimating grades in iron ore deposits
(2011)
Conference report
Open AccessRisk assessment and economic evaluation of mining projects are mainly affected by the determination of grades and tonnages. In the case of iron ore, multiple variables must be determined for ore characterization which ... 
Tests for identifying the unchanging reference component of compositional data using the properties of the coefficient of variation
(2011)
Conference report
Open AccessIn analyses of compositional data, it is important to select a suitable unchanging component as a reference to detect the behavior of a single variable in isolation. This paper introduces two tests for detecting the unchanging ... 
An EMalgorithm based method to deal with rounded zeros in compositional data under Dirichlet models
(2011)
Conference report
Open AccessZeros in compositional data are classified into “rounded” zeros and “essential” zeros. The rounded zero corresponds to a small proportion or below detection limit value while the essential zero is an indication of the ... 
Interpretation of orthonormal coordinates in case of threepart compositions applied to orthogonal regression for compositional data.
(2011)
Conference report
Open AccessOrthonormal coordinates are very important tool for compositional data processing using standard statistical methods. Namely, in order to express a Dpart composition in the Euclidean real space we use isometric logratio ... 
Graphing and communicating compositional data in high dimensions
(2011)
Conference report
Open AccessVisualization of data becomes more challenging as the dimensionality of the data increases, impacting not only the display of the data itself but also the modeling results. This paper discusses common visualization ... 
Analysis of compositional data using robust methods. The Rpackage robCompositons
(2011)
Conference report
Open AccessThe free and opensource programming language and software environment R (R Development Core Team, 2010) is currently both, the most widely used and most popular software for statistics and data analysis. In addition, R ... 
Statistical modelling of compositional problems involving finite probability distributions
(2011)
Conference report
Open AccessFinite probability distributions and compositional data are mathematically similar, consisting of Ddimensional positive vectors with sum 1. Despite this similarity the meaningful forms of analysis in these different ... 
Two more things about compositional biplots: quality of projection and inclusion of supplementary elements
(2011)
Conference report
Open AccessThe biplot is a widely and powerful methodology used with multidimensional data sets to describe and display the relationships between observations and variables in an easy way. Compositional data consist of positive ... 
Geochemistry versus grainsize relations of sediments in the light of comminution, chemical alteration, and contrasting source rocks
(2011)
Conference report
Open AccessAround 170 sediment samples from glacial and proximal glaciofluvial deposits have been analysed for their geochemical composition. Samples derive from two strongly contrasting source areas (granitoids vs. amphibolite) ... 
The shiftedscaled Dirichlet distribution in the simplex
(2011)
Conference report
Open AccessPerturbation and powering are two operations in the simplex that define a vectorspace structure. Perturbation and powering in the simplex play the same role as the sum and product by scalars in real space. A standard ... 
Compositional analysis of correlation of weather parameters with russet of 'golden delicious' apples
(2011)
Conference report
Open AccessThe development of russet on 'Golden Delicious' apples is a problem of concern to growers of fresh market apples. Russeting is considered to be due to untimely divisions of cells in the epidermis of the fruit initiated ... 
Pluviometric regionalization of Catalunya: a compositional data methodology
(2011)
Conference report
Open AccessThe aim of this paper is to introduce a methodology for de¯ning groups from regionalized com positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ... 
Properties of a square root transformation regression model
(2011)
Conference report
Open AccessWe consider the problem of modelling the conditional distribution of a response given a vector of covariates x when the response is a compositional data vector u. That is, u is defined on the unit simplex [...] This ... 
Compositional loess modeling
(2011)
Conference report
Open AccessCleveland (1979) is usually credited with the introduction of the locally weighted regression, Loess. The concept was further developed by Cleveland and Devlin (1988). The general idea is that for an arbitrary number of ... 
Measuring subcompositional incoherence
(2011)
Conference report
Open AccessSubcompositional coherence is a fundamental property of Aitchison’s approach to compositional data analysis, and is the principal justification for using ratios of components. For dimension reduction of a matrix of ... 
CoDaPack 2.0: a standalone, multiplatform compositional software
(2011)
Conference report
Open AccessHistorically CoDaPack 3D has intended to be a software of Compositional Data with an easy and intuitive way of use. For this reason from the beginning it has been associated to Excel, a software known and used for many ... 
Exploratory data analysis for fatty acid composition in pig meat
(2011)
Conference report
Open AccessFat content and composition are determinant factors affecting pork production and meat quality (Wood et al., 2003). Fat composition is commonly presented as the percentage of each individual fatty acid relative to total ... 
A compositional genetic analysis of oleic acid content in pig meat
(2011)
Conference report
Open AccessIntramuscular fat (IMF) content and composition, particularly the oleic fatty acid content (OL), are major quality characteristics of pork fresh and drycured products. They are known to be related to nutritional, ... 
Analysis of fossil planktonic foraminifera: the sieve mesh effect
(2011)
Conference report
Open AccessThe choice of the sediment size fraction in the analysis of fossil planktonic foraminifera is of great importance in determining the composition of assemblages. In past studies several size fractions have been utilised. ... 
Orthogonal regression for threepart compositional data via linear model with typeII constraints
(2011)
Conference report
Open AccessOrthogonal regression is a proper tool for fitting twodimensional data points when errors occur in both the variables. This type of modelling technique is also called the total least squares (TLS) in the statistical ... 
The stoichiometry of mineral compositions
(2011)
Conference report
Open AccessPrevious work by John Aitchison (1999) showed how logratio compositional data analysis can illuminate the relationships between components of a composition based on mineral constituents, However, his analysis was framed ... 
Practical aspects of compositional data analysis using regional geochemical survey data
(2011)
Conference report
Open AccessGovernment geological surveys and mineral exploration companies collect large amounts of geochemical data, which are used in search for mineral commodities or for determining environmental disturbances. These surveys ... 
Use of survey weights for the analysis of compositional data: some simulation results
(2011)
Conference report
Open AccessThe compositional space can be seen as a vector space, where the vector addition corresponds to perturbation and the multiplication by a scalar corresponds to powering (Aitchison, 1986; PawlowskyGlahn and Egozcue, 2001). ... 
Testing water pollution in a two layer aquifer
(2011)
Conference report
Open AccessWater bodies around urban areas may be polluted with chemical elements from urban or industrial activities. We study the case of underground water pollution. This is a serious problem, since underground water is high ... 
Compositional classes and diversity in archaeological ceramic studies
(2011)
Conference report
Open AccessArchaeological studies are based, at a large extent, on the study of the materials that form the different unearthed assemblages. Thus, ceramic assemblages are defined by their compositions, i.e. how many pots of different ... 
Morphometrics and compositional classes. The stuy of anthropomorphic sculptures from Teotihuacan (México)
(2011)
Conference report
Open AccessMorphometry is defined as the measurement of the external and perceptible characteristics, i.e., in a first approximation, of the shape or morphology of an object. It includes information related to the object’s appearance ... 
Examining indices of individuallevel resource specialization
(2011)
Conference report
Open AccessThe variety of resources that a population exploits is known as the “niche width”. A particular population has a narrow niche if only few kinds of the available resources are exploited by its members. When the individuals ... 
Threeway compositional data analysis
(2011)
Conference report
Open AccessFor the exploratory analysis of threeway data, e.g., measurements of a number of objects, on a number of variables at different points in time, Tucker analysis is one of the most applied technique to study threeway ... 
Compositional random data: a routine for CoDaPack
(2011)
Conference report
Open AccessGeneration of random variables are needed in the simulations of many natural process. For some random variables, di erent methodologies are known, specially into euclidean spaces. In this paper a routine for dealing with ... 
The compositional meaning of a detection limit
(2011)
Conference report
Open AccessIn compositional data analysis a value below detection limit (BDL) is typically modeled as the definitive information that the actual value is below some fixed value  the detection limit (see e.g. Palarea Albaladejo ... 
Could CODA methodology be useful in control chart techniques?
(2011)
Conference report
Open AccessOn standard control charts, the hypothesis of normality is usually assumed without any additional veri cation. Nevertheless, in some cases this assumption is not accurate and might cause errors in process quality monitoring. ... 
Compositional data analysis as a potential tool to study the (paleo)ecology of calcareous nannoplankton from the central portuguese submarine canyons (W off Portugal)
(2011)
Conference report
Open AccessSubmarine canyons are deep and steep incisions on the continental margins. The physical forcing mechanisms linked with these marine systems, such as the enhancement of upwelling and bottom sediment resuspension, are ... 
Modelling cohort seasonal mortality e ects in a compositional framework
(2011)
Conference report
Open AccessIn the late 20th century, the average age at death for Danes and Austrians aged 50 or above and born in the Spring was approximately 6 months older than those born in the Autumn (Doblhammer and Vaupel, 2001). The pattern ... 
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 ... 
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 ... 
Statistical inference for HardyWeinberg equilibrium using logratio coordinates
(2011)
Conference report
Open AccessTesting markers for HardyWeinberg 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 ... 
Approaching predatorprey LotkaVolterra equations by simplicial linear differential equations
(2011)
Conference report
Open AccessPredatorprey LotkaVolterra 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 ... 
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 ... 
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 ... 
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 ... 
Compositions and fuzzy compositions in decisionmaking models
(2011)
Conference report
Open AccessIn decisionmaking models, the compositions (Aitchison, 1986) are employed in various forms. They can represent the normalized weights of criteria in multiplecriteria decisionmaking models, or the probabilities of ... 
Compositional data analysis with RedR
(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 widelyused ... 
Selfconsistent modelling of Mercury’s surface composition and exosphere by solar wind sputtering
(2011)
Conference report
Open AccessA MonteCarlo model of exospheres was extended by treating the solar wind ion induced sputtering process, quantitatively in a selfconsistent way starting with the actual release of particles from the mineral surface of ... 
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 ... 
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 ...