J. A. Martín Fernández, V. Di Donato, V. Pawlowsky-Glahn, J. J. Egozcue

La información contenida en las partes de una composición es de naturaleza relativa. Su espacio muestral es un espacio cociente determinado por la relación de equivalencia de la invariancia por cambio de escala. Los métodos estadísticos para datos composicionales deben ser coherentes con la estructura de espacio métrico de su espacio muestral. Habitualmente, los investigadores de campos aplicados deben analizar composiciones formadas por un número muy elevado de partes. Un elemento importante del análisis consiste en agrupar las partes de la composición motivado principalmente por la reducción de la dimensión. En este trabajo se ilustra la técnica de agrupación automática de Ward mediante conjuntos de datos de composiciones de foraminíferos. Se explora la relación del método de Ward con algunos elementos básicos del análisis composicional: la distancia de Aitchison, la matriz de variación, las componentes principales, la operación amalgama y, en general, el espacio de las partes.

Keywords: datos composicionales, método de agrupación, distancia, varianza

Scheduled

Posters III
June 9, 2022  10:10 AM
Faculty Hall


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