[Forum SIS] Politecnico di Milano - Seminario Fiserova

[Alessandra Menafoglio]

Si avvisa che in data 21-11-2018, alle ore 14:30 precise, presso l'Aula
Seminari "F. Saleri" VI piano, Dipartimento di Matematica, Politecnico di
Milano, si svolgerà il seguente seminario:

 

Relatore

Eva Fiserova, Palacky University Olomouc, Czech Republic

 

Titolo

Working with compositional data in coordinates

 

Abstract

Compositional data are multivariate observations carrying only relative
information, popularly expressed in percentages, proportions, mg/kg, etc.
Because of features inherent to compositional data, such as scale invariance
and the relative scale, the statistical analysis of raw compositional data
often leads to spurious results. Natural principles of compositional data
are followed by the Aitchison geometry on a simplex, the sample space of
compositional data (Aitchison, 1986; Pawlowsky-Glahn et al., 2015). However,
because most standard statistical methods rely on the Euclidean geometry in
real space, compositional data need to be converted to this space prior to
statistical processing. In the lecture, we will present the log ratio
methodology for dealing with compositional data and several types of their
coordinate representations, such as orthonormal log-ratio coordinates, pivot
coordinates, weighted pivot coordinates (Hron et al., 2017), or symmetric
balances (Kynvclova et al., 2017).  Their usage will be demonstrated on
examples.

 

Tutti gli interessati sono invitati a partecipare.

 

Cordiali saluti,

Alessandra Menafoglio 

 

 

--

Alessandra Menafoglio

MOX - Dept. of Mathematics 

Politecnico di Milano

Piazza Leonardo da Vinci, 32,

20133, Milan – Italy 

Phone: +39 02 2399 4642    

Email: alessandra.menafoglio a polimi.it

 

 

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