Abstract
The paper presents the principles ofCompositional Data Analysis. This statistical method enables interpreting the data, being proportions of some whole. The two examples of implementation of this method were presented, with use ofhydrogeological and petrographical data. The visaulisation by means of ternary diagrams is helpful for interpreting the results. The method is particularly featured by the possibility of appllication of a range of helpful manipulations, such as: amalgamation, perturbation, unconstraining and centering of data.
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