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Ledesma P.,Escuela Nacional de Antropologia e Historia ENAH | Fuentes G.,National Autonomous University of Mexico | Jasso G.,National Autonomous University of Mexico | Toledo A.,National Autonomous University of Mexico | Meza I.,National Autonomous University of Mexico
CEUR Workshop Proceedings | Year: 2013

This paper presents a distance metric learning method for the 'PAN 2013 Author Identification' challenge. Our approach extracts multiple distance metrics of different document representations from which our system learns to tune each one of these distances and representations to form an combined distance metric. We reach this learning distances by means of linear programming, Support Vector Regression and Neuronal Networks models. As specified by the description of the task our system can be applied to English, Greek and Spanish, and can be configured to be language independent. We achieved moderately successful results on this PAN competition, with better results on the development test set. We present results with the official test set and our own corpus based on web documents.

Moreno-Estrada A.,Stanford University | Gignoux C.R.,Stanford University | Gignoux C.R.,University of California at San Francisco | Fernandez-Lopez J.C.,Instituto Nacional Of Medicina Genomica Inmegen | And 45 more authors.
Science | Year: 2014

Mexico harbors great cultural and ethnic diversity, yet fine-scale patterns of human genome-wide variation from this region remain largely uncharacterized. We studied genomic variation within Mexico from over 1000 individuals representing 20 indigenous and 11 mestizo populations. We found striking genetic stratification among indigenous populations within Mexico at varying degrees of geographic isolation. Some groups were as differentiated as Europeans are from East Asians. Pre-Columbian genetic substructure is recapitulated in the indigenous ancestry of admixed mestizo individuals across the country. Furthermore, two independently phenotyped cohorts of Mexicans and Mexican Americans showed a significant association between subcontinental ancestry and lung function. Thus, accounting for fine-scale ancestry patterns is critical for medical and population genetic studies within Mexico, in Mexican-descent populations, and likely in many other populations worldwide.

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