CODAPACK3D. A new version of Compositional Data Package
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The statistical analysis of compositional data should be treated using logratios of parts,
which are difficult to use correctly in standard statistical packages. For this reason a
freeware package, named CoDaPack was created. This software implements most of the
basic statistical methods suitable for compositional data.
In this paper we describe the new version of the package that now is called
CoDaPack3D. It is developed in Visual Basic for applications (associated with Excel©),
Visual Basic and Open GL, and it is oriented towards users with a minimum knowledge
of computers with the aim at being simple and easy to use.
This new version includes new graphical output in 2D and 3D. These outputs could be
zoomed and, in 3D, rotated. Also a customization menu is included and outputs could
be saved in jpeg format. Also this new version includes an interactive help and all
dialog windows have been improved in order to facilitate its use.
To use CoDaPack one has to access Excel© and introduce the data in a standard
spreadsheet. These should be organized as a matrix where Excel© rows correspond to
the observations and columns to the parts. The user executes macros that return
numerical or graphical results. There are two kinds of numerical results: new variables
and descriptive statistics, and both appear on the same sheet. Graphical output appears
in independent windows. In the present version there are 8 menus, with a total of 38
submenus which, after some dialogue, directly call the corresponding macro. The
dialogues ask the user to input variables and further parameters needed, as well as
where to put these results. The web site http://ima.udg.es/CoDaPack contains this
freeware package and only Microsoft Excel© under Microsoft Windows© is required to
run the software.
Kew words: Compositional data Analysis, Software
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