Resumen de Representation of species composition

Vera Pawlowsky Glahn , T MONREAL PAWLOWSKY, Juan José Egozcue Rubí

• An alternative to the de Finetti ternary diagram for representing variability of species composition is presented. The proposed alternative is based on the Aitchison geometry of the sample space. It allows statistical modelling and analysis without the problems derived from spurious correlation, typical of a standard analysis of proportions. The method is illustrated with data representing the species composition of Free and FAD tuna school sets sampled in the Indian and Atlantic Oceans during the 2002–2008 period by purse seiners.