Hyperelliptic curve: Difference between revisions

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In [[statistics]], '''compositional data''' are quantitative descriptions of the parts of some whole, conveying exclusively relative information.
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This definition, given by [[John Aitchison]] (1986) has several consequences:
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* A compositional data point, or '''composition''' for short, can be represented by a positive real vector with as many parts as considered. Sometimes, if the total amount is fixed and known, one component of the vector can be omitted.
 
* As compositions only carry relative information, the only information is given by the ratios between components. Consequently, a composition multiplied by any positive constant contains the same information as the former. Therefore, proportional positive vectors are equivalent when considered as compositions.
 
* As usual in mathematics, equivalent classes are represented by some element of the class, called a representative. Thus, equivalent compositions can be represented by positive vectors whose components add to a given constant <math>\scriptstyle\kappa</math>. The vector operation assigning the constant sum representative is called '''closure''' and is denoted by <math>\scriptstyle\mathcal{C}[\cdot]</math>:
 
:: <math>\mathcal{C}[x_1,x_2,\dots,x_D]=\left[\frac{x_1}{\sum_{i=1}^D x_i},\frac{x_2}{\sum_{i=1}^D x_i}, \dots,\frac{x_D}{\sum_{i=1}^D x_i}\right],\ </math>
 
where ''D'' is the number of parts (components) and <math> [\cdot]</math> denotes a row vector.
 
* Compositional data can be represented by constant sum real vectors with positive components, and this vectors span a '''[[simplex]]''', defined as
 
:: <math> \mathcal{S}^D=\left\{\mathbf{x}=[x_1,x_2,\dots,x_D]\in\mathbb{R}^D \left| x_i>0,i=1,2,\dots,D; \sum_{i=1}^D x_i=\kappa \right. \right\}. \ </math>
 
This is the reason why <math>\scriptstyle\mathcal{S}^D</math> is considered to be the sample space of compositional data. The positive constant <math>\scriptstyle\kappa</math> is arbitrary. Frequent values for <math>\scriptstyle\kappa</math> are 1 (per unit), 100 (percent, %), 1000, 10<sup>6</sup> (ppm), 10<sup>9</sup> (ppb), ...
 
*In [[statistics]], compositional data is frequently considered to be data in which each [[data point]] is an ''D''-tuple of nonnegative numbers whose sum is 1. Typically each of the ''D'' components ''x''<sub>''i''</sub> of each data point [''x''<sub>1</sub>, ..., ''x''<sub>''D''</sub>] says what proportion (or "percentage") of a statistical unit falls into the ''i''th category in a list of ''D'' categories. Very often [[ternary plot]]s are used in analysis of compositional data to represent a three part composition.
 
* An alternative nomenclatures for '''compositional analysis''' is ''simplicial analysis'', motivated by the concept of [[simplicial set]]s.
 
Remarks on the definition of the simplex:
 
* In mathematical frameworks, the superscript of <math>\scriptstyle\mathcal{S}^D</math>, accounting for the number of parts, is often changed to ''D''&nbsp;&minus;&nbsp;1, describing the dimension.
 
* The components of the vector are assumed to be positive. However, in some definitions of the simplex, non-negative components are admitted. Here null components are avoided, because ratios between components of which some are zero are meaningless.
 
==Examples==
*Each data point may correspond to a rock composed of three different minerals; a rock of which 10% is the first mineral, 30% is the second, and the remaining 60% is the third would correspond to the triple [0.1,&nbsp;0.3,&nbsp;0.6]; a [[data set]] would contain one such triple for each rock in a sample of rocks.
 
*Each data point may correspond to a town; a town in which 35% of the people are Christians, 55% are Muslims, 6% are Jews, and the remaining 4% are others would correspond to the quadruple [0.35,&nbsp;0.55,&nbsp;0.06,&nbsp;0.04]; a data set would correspond to a list of towns.
 
* In chemistry, compositions can be expressed as molar concentrations of each component. As the sum of all concentrations is not determined, the whole composition of ''D'' parts is needed and thus expressed as a vector of ''D'' molar concentrations. These compositions can be translated into weight per cent multiplying each component by the appropriated constant.
 
* In a survey, the proportions of people positively answering some different items can be expressed as percentages. As the total amount is identified as 100, the compositional vector of ''D'' components can be defined using only ''D''&nbsp;&minus;&nbsp;1 components, assuming that the remaining component is the percentage needed for the whole vector to add to 100.
 
* In probability and statistics, a partition of the sampling space into disjoint events is described by the probabilities assigned to such events. The vector of ''D'' probabilities can be considered as a composition of ''D'' parts. As they add to one, one probability can be suppressed and the composition is completely determined.
 
==External links==
* [http://www.compositionaldata.com/ CoDaWeb - Compositional Data Website]
* [http://hdl.handle.net/10256/297 Pawlowsky-Glahn, V., Egozcue, J.J., Tolosana-Delgado, R. (2007), Lecture Notes on Compositional Data Analysis. ]
* [http://en.wikibooks.org/wiki/Why,_and_How,_Should_Geologists_Use_Compositional_Data_Analysis Why, and How, Should Geologists Use Compositional Data Analysis] (wikibook)
 
==References==
* J. Aitchison, 1986: ''The Statistical Analysis of Compositional Data'', Chapman & Hall, reprinted in 2003 with additional material by The Blackburn Press
 
[[Category:Statistical data types]]

Latest revision as of 04:36, 22 June 2014

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