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Differential Models for Evolutionary Compositions

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Abstract

General systems are frequently decomposable into parts and these parts can evolve in time or space, a frequent occurrence in the field of Geosciences. In most cases, fitting models to forecast future states of the system is a goal of the analysis. Modelling interactions between parts may also be of common interest. The system can be analysed from different points of view; the traditional one consists in modelling each part of the system in time. Alternatively, modelling the evolution of the parts as proportions is proposed herein and attention is centred on the compositional evolution. The compositions are expressed in orthogonal coordinates (ilr) and then modelled using first-order differential equations with constant coefficients. Simple models are shown to be very flexible, including many of the standard growth curve models. The models are fitted using regression techniques on the integrated coordinates. The use and interpretation of these differential models is illustrated with several examples: a simulated example; urban waste in Catalonia (Spain); oil production and reserves; and growth of a luzonite crystal.

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Acknowledgments

This research has been supported by the Spanish Ministries of Education, Science and Innovation, Economy and Competitiveness under the projects CODA-RSS Ref. MTM2009-13272, and METRICS Ref. MTM2012-33236. The authors are grateful for discussions and helpful advise from R. Tolosana-Delgado and an anonymous reviewer.

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Correspondence to Juan José Egozcue.

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Egozcue, J.J., Jarauta-Bragulat, E. Differential Models for Evolutionary Compositions. Math Geosci 46, 381–410 (2014). https://doi.org/10.1007/s11004-014-9533-2

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