CoDaWeb

What is CoDA?

...parts of a whole...

Compositional Data Analysis (CoDA) refers to the analysis of compositional data (CoDa), which have been defined historically as random vectors with strictly positive components whose sum is constant (e.g., 100, one, a million). More recently, the term covers all those vectors representing parts of a whole which only carry relative information, thus including not only parts per unit or percentages, but also molar compositions.

Typical examples in different fields are: geology (geochemical elements), economy (income/expenditure distribution), medicine (body composition: fat, bone, lean), questionnaire surveys (ipsative data), food industry (food composition: fat, sugar, etc), chemistry (chemical composition), ecology (abundance of different species), paleontology (foraminifera taxa), agriculture (nutrient balance ionomics), sociology (time-use surveys), environmental sciences (soil contamination), and genetics (genotype frequency). This type of data appears in most applications, and the interest and importance of consistent statistical methods cannot be underestimated. Although the concern of the problems related to them was kept alive mainly by researchers from the field of Geosciences, in particular by members of the International Association for Mathematical Geosciences, the awareness of coherent methods is growing in the environmental and biological sciences.

Find Us

Address:: Dept. IMAE; Campus Montilivi (Edifici P4); M. Aurèlia Campmany, 61; Girona (E-17003), Spain
Phone:: +34 972 418 417

Why choose us

...forum for the exchange...

This hot topic of research has nowadays a broad impact in these fields. However, it took a long time to find a solution to the problem of how to perform a proper statistical analysis of this type of data, i.e. to solve the problem of the spurious correlation, as it was named by Karl Pearson back in 1897, or the closure problem as called by Felix Chayes in the 1960's. Because standard statistical techniques loose their applicability and classical interpretation when applied to compositional data, new techniques were needed. No theoretically sound solution was proposed until the 1980's, when John Aitchison set forth a consistent theory based on log-ratios. Later developments have shown that the mathematical foundation of a proper statistical analysis for this type of data is based on the definition of a specific geometry on the simplex (the sample space of compositional data). Based on it, is possible to rigorously develop any statistical analysis (cluster analysis, discriminant analysis, factor analysis, regression models, to mention just a few).

Practitioners interested in CoDa find in this web site a forum for the exchange of information, material and ideas. This web site has been planned, and is currently maintained, by the members of the Research Group on Compositional Data Analysis at the Dept. Informàtica, Matemàtica Aplicada i Estadística (IMAE-UdG) under the projects COmpositional Data Analysis and RElated meThOdS (CODA-RETOS) and COmpositional and Spatial Data Analysis (COSDA). The core of the group belongs to the University of Girona (UdG), and includes members from the Technical University of Catalonia (UPC), and Biomathematics & Statistics Scotland (BioSS). All the researchers whose interest goes from real case studies to the mathematical foundations of CoDA are welcomed! Join us!

Work team

...let's start working on...

Vera Pawlowsky-Glahn

PhD in Mathematics. Full Professor (UdG).

Germà Coenders

PhD in Management Sciences. Titular Professor (UdG).

Jan Graffelman

PhD in Statistics. Titular Professor (UPC).

Glòria Mateu-Figueras

PhD in Statistics. Associated Professor (UdG).

Santiago Thió-Fdz.-de-Henestrosa

PhD in Computer Science. Titular Professor (UdG).

Juan José Egozcue

PhD in Physics. Full Professor
(UPC).

Pepus Daunis-i-Estadella

PhD in Statistics. Titular Professor (UdG).

Eusebi Jarauta

PhD in Industrial Engineering. Titular Professor (UPC).

Maribel Ortego

PhD in Mathematics. Associated Professor (UPC).

Marina Vives-Mestres

PhD in Statistics. Researcher and part-time university lecturer (UdG).

Carles Barceló-Vidal

PhD in Statistics. Emeritus Professor (UdG).

Berta Ferrer-Rosell

PhD in Tourism. Visiting lecturer at University of Lleida (UdL).

Josep A. Martín-Fernández

PhD in Statistics. Titular Professor (UdG).

Javier Palarea-Albaladejo

PhD in Statistics. Senior Statistical Scientist (BioSS).

Who is Who?

...some CoDa-people...

Name:ADEBANJI, ATINUKE
Email: TINUADEBANJI@YAHOO.COM
Address: Department of Mathematics, KNUST, Kumasi, Ghana
Institution: KWAME NKRUMAH UNIVERSITY OF SCIENCE AND TECHNOLOGY, KUMASI
Position: Lecturer
Website

Name:Albanese, Stefano Albanese
Email: stefano.albanese@unina.it
Address: VIA MEZZOCANNONE 8
Institution: Univesità di Napoli FEDERICO II
Position: Professor
Website

Name:Albayrak, Serkan Albayrak
Email: rfsrkn@gmail.com
Address: Izmir
Institution: Yasar University
Position: Assistant Professor

Name:Ali, Zeeshan
Email: zeeshan.ali@warwick.ac.uk
Address: 7 Spencer Road, Earlsdon, Coventry, UK
Institution: The University of Warwick, UK
Position: PhD (Statistics) Student

Name:Asis, Constancio
Email: asis.tony@gmail.com
Address: 2 Calder Court, Malak, NT Australia
Institution: Department of Primary Industry and Fisheries Northern Terriotory Government Australia
Position: Senior Research Agronomist

Name:Balkin, Alexander
Email: balkinas@yandex.ru
Address: 11, Pionerskaya st. 460000 Orenburg, Russia
Institution: Institute for cellular and intracellular symbiosis
Position: Researcher
Website

Name:Barceló-Vidal, Carles
Email: carles.barcelo@udg.edu
Address: Dept. IMAE, Edifici P4, Campus Montilivi, E-17071 Girona (Spain)
Institution: Universitat de Girona
Position: Emeritus Titular Professor
Website

Name:Barrientos, Mauricio
Email: mauricio.barrientos@ki.se
Address: Stockholm
Institution: Karolinska Institutet
Position: Ph. D student

Name:Bayari, Eric Enzula
Email: ericenzula@yahoo.com
Address: KNUST Kumasi, Ghana
Institution: KNUST
Position: Postgraduate Student

Name:Braga, Luis
Email: obsuni@observatoriodauniversidade.blog.br
Address: c.p 2386 20010-974 Rio de Janeiro RJ Brasil
Institution: UFRJ
Position: Professor
Website

Name:Cardoso, Margarida
Email: margarida.cardoso@iscte.pt
Institution: ISCTE-IUL
Position: Professor
Website

Name:carpita, stefano
Email: carpitastefano@gmail.com

Name:Christie, Mario
Email: christie.mario@yahoo.com
Address: 275 7 West Greater Portmore PO
Institution: University of the West Indies, Mona
Position: Student

Name:Comas-Cufí, Marc
Email: mcomas@imae.udg.edu
Address: Dept. IMAE, Edifici P4, Campus Montilivi, E-17071 Girona (Spain)
Institution: Universitat de Girona

Name:Darabi-Golestan, Farshad
Email: pcdar2000@yahoo.com
Institution: Amirkabir University of technology
Position: Ph.D. candidate

Name:Daunis-i-Estadella, Pepus
Email: pepus@imae.udg.edu
Address: Dept. IMAE, Edifici P4, Campus Montilivi, Carrer Univ. de Girona, 6 E-17003 Girona (Spain)
Institution: Universitat de Girona

Name:Deng, Tao
Email: 1083903583@qq.com

Name:dr, Nidhi Gupta
Email: NGU@nrcwe.dk
Address: Lerso Parkelle 105
Institution: nrcwe
Position: researcher
Website

Name:Edjabou, Vincent
Email: vine@env.dtu.dk
Institution: DTU
Position: Student

Name:Egozcue, Juan José
Email: juan.jose.egozcue@upc.edu
Address: Enginyeria Civil i Ambiental, EDIFICI C2, PLANTA 3, C. JORDI GIRONA, 1-3, 08034 BARCELONA (Spain)
Institution: Universitat Politècnica de Catalunya
Position: Full Professor

Name:Evans, Jedy
Email: jedyevans@gmail.com
Address: NA
Institution: African Institute for Mathematical Sciences
Position: Student
Website

Name:Fisch, Greg
Email: Gfisch9862@aol.com

Name:Flood, Rory
Email: rflood02@qub.ac.uk
Website

Name:Franquet, Álvaro
Email: alvarofranq@gmail.com
Institution: Universitat de Girona

Name:Fry, Tim
Email: tim.fry@rmit.edu.au
Address: School of Economics, Finance and Marketing, RMIT University, GPO Box 2476, Melbourne VIC 3001 Australia
Institution: RMIT University
Position: Full Professor
Website

Name:gomez, claudia
Email: claudiayamilegomez@gmail.com
Address: Av 17 E 9N 35 Conjunto Galicia In 25B
Institution: UFPS
Position: Docente

Name:Gong, Peng
Email: 360464454@qq.com

Name:herms, ignasi
Email: ignasi.herms@icgc.cat
Address: Parc Montjuic, s/n
Institution: Institut Cartogràfic i Geològic de Catalunya
Position: Head of The Geological Resources Area
Website

Name:Hood, Shawn Hood
Email: Shawn.Hood@utas.edu.au
Address: 1 Ascot Ave
Institution: University of Tasmania
Position: PhD Research
Website

Name:Hou, Qingye
Email: qingyehou@gmail.com
Address: 29 Xueyuan Rd, Haidian district, Beijing, China
Institution: China University of Geosciences (Beijing)
Position: associate professor

Name:Jama, Saed
Email: siciid522@hotmail.com
Address: Turkey
Institution: Anadolu university
Position: Student

Name:James, John
Email: johnandlucyjames@mac.com
Address: 6464 South Downing Street Centennial, CO 80121 USA
Institution: Neisseria Research, LLC
Position: Microbiologist

Name:kenett, ron
Email: ron@kpa-group.com
Institution: KPA and UNITO
Position: Research Professor
Website

Name:Khatri, Shubham
Email: shubhamkhatri216@gmail.com
Institution: G.B. Pant University of Agriculture and Technology
Position: M.Tech. Scholar

Name:Kuzik, Nicholas
Email: nkuzik@ualberta.ca
Institution: University of Alberta
Position: Graduate Student

Name:Lo, Ernest
Email: ernest.lo@inspq.qc.ca
Institution: McGill University, Institut National de Santé Publique du Québec (INSPQ)

Name:Manhães, Marco
Email: marcomanhaes@bol.com.br

Name:MARCILLO, JUAN
Email: caperuzo23@gmail.com
Address: Barcelona
Institution: UPC
Position: student

Name:Martín-Fernández, Josep-Antoni
Email: josepantoni.martin@udg.es
Address: Dept. IMAE, Edifici P4, Campus Montilivi, E-17071 Girona (Spain)
Institution: University of Girona
Position: Titular Professor
Website

Name:mendes, auriio
Email: auriomendes00@gmail.com
Address: Av. Eduardo Mondlane
Institution: UEM
Position: Student
Website

Name:MENDES, AURIO
Email: auriomende00s@gmail.com
Institution: UEM
Website

Name:Mireles, Miguel
Email: migueladrianmireles@gmail.com
Address: Av. Carl Friedrich Gauss 3
Institution: ICFO
Position: Student
Website

Name:Modabberi, Soroush Modabberi
Email: modabberi@ut.ac.ir
Address: School of Geology, University of Tehran, Enghelab Avenue
Position: University of Tehran

Name:Monti, Gianna
Email: gianna.monti@unimib.it
Address: Dep. of Economics, Management and Statistics (DEMS), Via Bicocca degli, Arcimboldi 8, 20126 Milano, Italy
Institution: University of Milano-Bicocca
Position: Assistant Professor

Name:Núñez, Héctor
Email: hector.mantilla@geopinar.gms.minem.cu
Address: Ave 57 # 14003 apto 5 e/ 140 y 142 Marianao, La Habana, Cuba
Institution: GeomineraPinar
Position: Geólogo

Name:Oliver, Lia
Email: lia.oliver@goodgut.eu
Address: Pic de Peguera 15
Institution: GoodGut

Name:Ordonez-Calderon, Juan Carlos
Email: ordonez.jc@gmail.com
Address: 25 York Street, 17th Floor, Toronto, ON, M5J 2V5
Institution: Kinross Gold
Position: Manager, Resource Geochemistry
Website

Name:Ortego-Martínez, Maribel
Email: ma.isabel.ortego@upc.edu
Address: Dep. Enginyeria Civil i Ambiental, EDIFICI C2, PLANTA 3, C. JORDI GIRONA, 1-3, 08034 BARCELONA (SPAIN)
Institution: Universitat Politècnica de Catalunya

Name:Palarea Albaladejo, Javier
Email: javier@bioss.ac.uk
Institution: Biomathematics and Statistics Scotland
Website

Name:panda, santanu
Email: santanu20@gmail.com
Address: India
Institution: GSI
Position: Geologist

Name:patron, niccolo
Email: niccolo.patron@protonmail.com
Institution: Private
Position: Scientist

Name:Pawlowsky-Glahn, Vera
Email: vera.pawlowsky@udg.edu
Address: Dept. IMAE, Edifici P4, Campus Montilivi, E-17071 Girona (Spain)
Institution: University of Girona
Position: Full Professor

Name:Plata Rincón, Catalina
Email: catalinaplatar@gmail.com
Institution: Universidad Santo Tomás

Name:Punya-in, Sutthida
Email: punyain.s@gmail.com
Institution: Rajamangala University of Technology Lanna
Position: Lecturer

Name:Quispe, Alejandro
Email: alejandro362@hotmail.com
Institution: UPC
Position: Estudiante

Name:Rodriguez Romero, Viviana Alejandra
Email: rodriguezva@vcu.edu
Institution: Virginia Commonwealth University
Position: Student

Name:Sajdak, Marcin
Email: msajdak@ichpw.zabrze.pl
Institution: Institute for Chemical Processing of Coal (ICPC )
Position: Eng.&Tech. specialist

Name:Sophia, VAUCLIN
Email: sophia.vauclin@entpe.fr
Institution: ENTPE (University of Lyon)
Position: PhD student

Name:SUAREZ, CARLOS
Email: carlos.suarez1973@yahoo.es
Address: EL CONDE
Institution: PARTICULAR
Position: INVESTIGADOR

Name:THIOMBANE, MATAR
Email: thiombane.matar@unina.it
Address: Via mezzocanone, 16 4th floor Naples
Institution: University Federico II Naples-Italy
Position: PhD Student

Name:Thompson, John
Email: jmtdoc@btinternet.com
Address: Institute of Research & Development, Birmingham Research Park, Birmingham B15 2SQ, UK
Institution: Tracer Measurement System Ltd.
Position: Director
Website

Name:Trauth, Martin
Email: trauth@uni-potsdam.de
Address: Karl-Liebknecht-Strasse 24, 14476 Potsdam
Institution: University of Potsdam
Position: Geologist; professor
Website

Name:TRINH, Thi Huong
Email: trinhthihuong@tmu.edu.vn
Address: 21 Allée de Brienne
Institution: Toulouse School of Economics
Position: PhD
Website

Name:Tsagris, Michael
Email: pmxmt1@nottingham.ac.uk
Institution: Unisersity of Nottingham
Position: PhD student
Website

Name:Verswijveren, Simone Verswijveren
Email: sjverswi@deakin.edu.au
Institution: Deakin University
Position: PhD Student

Name:Vezzoli, Giovanni
Email: giovanni.vezzoli@unimib.it
Address: Dipartimento di Scienze dell Ambiente e del Territorio e di Scienze della Terra, Piazza della Scienza, 4 20126 Milano (Italy)
Institution: University of Milano-Bicocca
Position: Geologist Researcher
Website

Name:Xiaohong, Guo
Email: xiaohong9g@gmail.com
Institution: China University of Geosciences(Beijing)
Position: PhD candidate