Which dissimilarity is to be used when extracting typologies in sequence analysis? A comparative study

Originally developed in bioinformatics, sequence analysis is being increasingly used in social sciences for the study of life-course processes. The methodology generally employed consists in computing dissimilarities between the trajectories and, if typologies are sought, in clustering the trajectories according to their similarities or dissemblances. The choice of an appropriate dissimilarity measure is a major issue when dealing with sequence analysis for life sequences. Several dissimilarities are available in the literature, but neither of them succeeds to become indisputable. In this paper, instead of deciding upon one dissimilarity measure, we propose to use an optimal convex combination of different dissimilarities. The optimality is automatically determined by the clustering procedure and is defined with respect to the within-class variance.

光纤转接器结构

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Educaci??n y valores en Espa??a : actas del seminario : C??diz, 26-28 de noviembre de 1991

Se recogen las ponencias y comunicaciones presentadas en el seminario 'Educaci??n y valores en Espa??a, organizado por el Grupo de trabajo de Educaci??n de la Comisi??n Espa??ola de la UNESCO, celebradas en Granada durante los d??as 26, 27 y 28 de novimebre de 1991. Se aborda el tema desde tres niveles: se comienza por el m??s amplio: los valores en el mundo, en Espa??a, y en el sistema educativo, al que se dedican las tres primeras ponencias; se continua por el nivel intermedio: los valores en la escuela tal y como son percibidos por la comunidad educativa; y se finaliza con dos ponencias dedicadas a aspectos concretos de la trasmisi??n de valores en el aula: la educaci??n c??vica y ??tica.