Now showing items 1-20 of 31

    • A compositional analysis approach assessing the spatial distribution of trees in Guadalajara, Mexico 

      Cruz Sandoval, Marco Antonio; Ortego Martínez, María Isabel; Roca Bosch, Elisabet (Università di Cassino e del Lazio Meridionale, 2019)
      Conference report
      Open Access
      Urban green infrastructure such as parks, gardens and trees, provide several ecosystem services and benefits. Particularly trees provide a broad amount of services in urban areas, such as improving air quality, mitigating ...
    • A compositional approach for modelling SDG7 indicators: case study applied to electricity access 

      Marcillo Delgado, Juan Carlos; Ortego Martínez, María Isabel; Pérez Foguet, Agustí (2019-06)
      Article
      Restricted access - publisher's policy
      Monitoring energy indicators has acquired a renewed interest with the 2030 Agenda for Sustainable Development, and specifically with goal 7 (SDG7), which seeks to guarantee universal access to energy. The predominant ...
    • An Exploratory Multivariate Statistical Analysis to Assess Urban Diversity 

      Salazar Llano, Lorena; Rosas Casals, Martí; Ortego Martínez, María Isabel (2019-07-11)
      Article
      Open Access
      Understanding diversity in complex urban systems is fundamental in facing current and future sustainability challenges. In this article, we apply an exploratory multivariate statistical analysis (i.e., Principal Component ...
    • Análisis de datos composicionales: aguas, contaminantes, recursos, sociología... 

      Egozcue Rubí, Juan José; Tolosana Delgado, Raimon; Jarauta Bragulat, Eusebio; Ortego Martínez, María Isabel; Díaz Barrero, José Luis (Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyers de Camins Canals i Ports de Barcelona, 2011-11-15)
      Conference lecture
      Open Access
      Los datos composicionales describen las partes de un todo. Se presentan en forma de vectores proporciones, porcentajes, concentraciones químicas etc. y aparecen en multitud de campos de la ciencia y la ingeniería. A pesar ...
    • Análisis y previsión de fenómenos naturales peligrosos 

      Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Ortego Martínez, María Isabel; Sánchez-Arcilla Conejo, Agustín (Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyers de Camins Canals i Ports de Barcelona, 2011-11-16)
      Conference lecture
      Open Access
      La toma de decisiones referentes al diseño o en sistemas de alerta requieren el estudio de las acciones externas (frecuentemente meteorológicas), la descripción probabilista del sistema (vulnerabilidad, susceptibilidad) ...
    • Bayesian estimation of the orthogonal decomposition of a contingency table 

      Ortego Martínez, María Isabel; Egozcue Rubí, Juan José (2016)
      Article
      Open Access
      In a multinomial sampling, contingency tables can be parametrized by probabilities of each cell. These probabilities constitute the joint probability function of two or more discrete random variables. These probability ...
    • Bayesian estimation of the orthogonal decomposition of a contingency table 

      Ortego Martínez, María Isabel; Egozcue Rubí, Juan José (2015)
      Conference report
      Open Access
      Contingency tables can be parametrized by probabilities of each cell in a multinomial sampling. These probabilities constitute the joint probability function of the two or more discrete random categorical variables. These ...
    • Bayesian trend analysis for daily rainfall series of Barcelona 

      Ortego Martínez, María Isabel; Gibergans Bàguena, José; Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Llasat Botija, Maria Carmen (2010-07-15)
      Article
      Open Access
      A Point-Over-Threshold approach using a reparameterization of the Generalized Pareto Distribution (GPD) has been used to assess changes in the daily rainfall Barcelona series (1854–2006). A Bayesian approach, considering ...
    • Changes in the occurrence of extreme wave storms in the Catalan coast: a Bayesian approach 

      Corral López, Jesús; Ortego Martínez, María Isabel (Universitat de Barcelona. Edicions i Publicacions, 2016)
      Conference lecture
      Restricted access - publisher's policy
    • Characterizing the evolution of the container traffic share in the mediterranean sea using hierarchical clustering 

      Grifoll Colls, Manel; Karlis, Thanassis; Ortego Martínez, María Isabel (2018-12)
      Article
      Open Access
      This research investigates the traffic share evolution of the container throughput in the Mediterranean ports from 2000 to 2015 considering hierarchical clustering and concentration indexes. Compositional Data analysis ...
    • Checking model-data weather hazard occurrence fit in the context of climate change 

      Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2011)
      Conference report
      Open Access
      In climate change impact studies it is common to run a given response model (from ecosystem changes to wavestorm or landslide occurrence) nested into one of the available long-term Global or Regional Circulation Models ...
    • Climate change in a Point-Over-Threshold model: an example on ocean-wave-storm hazard in NE Spain 

      Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2010-09-27)
      Article
      Open Access
      A reparametrization of the Generalized Pareto Distribution is here proposed. It is suitable to parsimoniously check trend assumptions within a Point-Over-Threshold model of hazardous events. This is based on considerations ...
    • Compositional analysis approach in the measurement of social-spatial segregation trends. A case study of Guadalajara, Jalisco, Mexico 

      Cruz Sandoval, Marco Antonio; Ortego Martínez, María Isabel; Roca Bosch, Elisabet (2019)
      Conference lecture
      Open Access
      Different authors have highlighted the internal existing social differences in cities as a consequence of different economic, social and political forces. The mercantile logic that affects urban spaces incentives the ...
    • Compositional data analysis approach in the measurement of social-spatial segregation: towards a sustainable and inclusive city 

      Cruz Sandoval, Marco Antonio; Roca Bosch, Elisabet; Ortego Martínez, María Isabel (2020-05-24)
      Article
      Open Access
      The location and context in which people live influences and conditions their opportunities in life. This becomes relevant in a world subject to rapid urban and demographic growth, in which different economic, social, and ...
    • Compositional data for global monitoring: the case of drinking water and sanitation 

      Pérez Foguet, Agustí; Giné Garriga, Ricard; Ortego Martínez, María Isabel (2017-07)
      Article
      Open Access
      Introduction At a global level, access to safe drinking water and sanitation has been monitored by the Joint Monitoring Programme (JMP) of WHO and UNICEF. The methods employed are based on analysis of data from household ...
    • Compositional data techniques for the analysis of the container traffic share in a multi-port region 

      Grifoll Colls, Manel; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José (Springer, 2019-12)
      Article
      Open Access
      The statistical techniques based on compositional data are applied to investigate the evolution of the traffic share of the container throughput in a multi-port system. Compositional vectors are those which contain relative ...
    • Differences in assigning probabilities to coastal inundation hazard estimators: event versus response approaches 

      Sanuy Vázquez, Marc; Jiménez Quintana, José Antonio; Ortego Martínez, María Isabel; Toimil Silva, Alexandra (2020-01)
      Article
      Open Access
      Coastal flood risk assessment requires a reliable estimation of the frequency of inundation hazards, that is, characterising the hazard magnitude and assigning a probability of occurrence. In this work we analyse the ...
    • Estimación bayesiana de cópulas extremales en procesos de Poisson 

      Ortego Martínez, María Isabel (Universitat Politècnica de Catalunya, 2015-02-04)
      Doctoral thesis
      Open Access
      The estimation of occurrence probabilities of extremal quantities is essential in the study of hazards associated with natural phenomena. The extremal quantities of interest usually correspond to phenomena characterized ...
    • Modelling of future extreme storm surges at the NW Mediterranean coast (Spain) 

      Lin Ye, Jue; García León, Manuel; Gracia Garcia, Vicente; Ortego Martínez, María Isabel; Lionello, Piero; Conte, Dario; Pérez Gómez, Begoña; Sánchez-Arcilla Conejo, Agustín (2020-02)
      Article
      Open Access
      Storm surges are one of the main drivers for extreme flooding at the coastal areas. Such events can be characterized with the maximum level in an extreme storm surge event (surge peak), as well as the duration of the event. ...
    • Modified Kolmogorov-Smirnov test of goodness of fit 

      Monti, Gianna S.; Mateu Figueras, Gloria; Ortego Martínez, María Isabel; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2017)
      Conference report
      Open Access
      A modified version of the Kolmogorov-Smirnov (KS) test is presented as a tool to assess whether a specified, although arbitrary, probability model is unsuitable to describe the underlying distribution of a set of observations. ...