Now showing items 1-20 of 33

    • A GEE moving average analysis of the relationship between air pollution and mortality for asthma in Barcelona, Spain 

      Marc, Sáez; Aurelio, Tobias; Muñoz Gracia, María del Pilar; Campbell, M J (1999-08)
      Article
      Restricted access - publisher's policy
      Several studies have assessed the association between air pollution and hospital admissions or emergency room visits for asthma. Because of both the presence of missing data and the small number of observations, the ...
    • A web-based learning tool improves student performance in statistics: a randomized masked trial 

      González Alastrué, José Antonio; Jover, Lluís; Cobo Valeri, Erik; Muñoz Gracia, María del Pilar (2010-03)
      Article
      Open Access
      Background: e-status is a web-based tool able to generate different statistical exercises and to provide immediate feedback to students’ answers. Although the use of Information and Communication Technologies (ICTs) is ...
    • Are the markets influenced by the frequency and the long relationships? 

      Márquez, M. Dolores; Muñoz Gracia, María del Pilar (2008)
      Conference report
      Restricted access - publisher's policy
      This paper analyzes the multivariate volatility effects among the indexes returns time series of the main stock markets. We detect, applying cointegration techniques, relations of interdependence between these markets and ...
    • Artificial neural networks applied to forecasting time series 

      Montaño Moreno, Juan José; Palmer Pol, Alfonso; Muñoz Gracia, María del Pilar (2011)
      Article
      Restricted access - publisher's policy
      This study offers a description and comparison of the main models of Artificial Neural Networks (ANN) which have proved to be useful in time series forecasting, and also a standard procedure for the practical application ...
    • Cobertura vacunal de gripe y evolución de la morbilidad declarada y la mortalidad por todas las causas en Cataluña 

      Muñoz Gracia, María del Pilar; Soldevila, Nuria; Martínez, A.; Carmona, G.; Batalla, J.; Acosta Argueta, Lesly María; Domínguez, Àngela (2010-10)
      Article
      Open Access
    • Comments on: space-time wind speed forecasting for improved power system dispatch 

      Muñoz Gracia, María del Pilar (2014-02-27)
      Article
      Restricted access - publisher's policy
    • Contagion between United States and european markets during the recent crises 

      Muñoz Gracia, María del Pilar; Márquez Cebrián, Dolores; Sánchez Espigares, Josep Anton (2011-07)
      Article
      Open Access
      The main objective of this paper is to detect the existence of financial contagion between the North American and European markets during the recent crises. To accomplish this, the relationships between the US and the Euro ...
    • E-status: a web tool for learning by doing exercises 

      González Alastrué, José Antonio; Muñoz Gracia, María del Pilar (University of Creta, 2002)
      Conference report
      Open Access
      The paper introduces the project led by a team of teachers to assist students learn statistics. The goal is to build a tool able to present mathematical problems and to correct the students´ answers. The problems may include ...
    • E-status: entorno web para la generación y resolución de problemas numéricos 

      González Alastrué, José Antonio; Muñoz Gracia, María del Pilar; Cobo Valeri, Erik; Martí Recober, Manuel (2005-02)
      Conference report
      Open Access
      Se presenta un sistema basado en plataformas web que pretende ayudar a los estudiantes a aprender estadística mediante la generación de problemas individualizados de tipo numérico con corrección instantánea. Como los ...
    • Effectiveness of measles vaccination for control of exposed children 

      Barrabeig, Irene; Rovira, Ariadna; Rius, Cristina; Muñoz Gracia, María del Pilar; Soldevila, Nuria; Batalla, Joan; Domínguez, Àngela (Lippincott Williams & Wilkins, 2010-09-14)
      Article
      Restricted access - publisher's policy
      The effectiveness of measles vaccine for postexposure prophylaxis at educational centers was investigated. A total of 166 children who shared the classroom with 10 confirmed cases during the infectious period of cases ...
    • Efficiency in the design of clinical trials with ordinal scales 

      Torres, Juan Vicente; Cortés, Jordi; González, Jose Antonio; Muñoz Gracia, María del Pilar; Sánchez, Josep Anton; Secades, Julio; Cobo Valeri, Erik (2009-09)
      Conference lecture
      Restricted access - confidentiality agreement
      The most popular statistical methods for analyzing ordinal data are reviewed in this work. Theoretical results are compared to empirical results by means of simulations. It is shown how the efficiency of the trial can be ...
    • Estimació del pol i de la variància del soroll d'un model AR(1) mitjançant filtratge no lineal 

      Muñoz Gracia, María del Pilar; Martí Recober, Manuel; Egozcue Rubí, Juan José (Universitat Politècnica de Barcelona. Centre de Càlcul, 1988)
      Article
      Open Access
      L'estimació dels paràmetres associats a un procés ARMA es pot plantejar com un problema de filtratge no lineai. Per determinar un estimador recursiu d'aquests paràmetres es deflneix un vector d'estat ampliat que inclou les ...
    • Estimació dels paràmetres de models ARMA (P,Q) mitjançant algorismes de filtratge òptim 

      Muñoz Gracia, María del Pilar (Universitat Politècnica de Catalunya, 1988-01-01)
      Doctoral thesis
      Open Access
      El objetivo del trabajo era sintetizar un filtro no lineal optimo para la estimación de parámetros de modelos arma. El interés de un filtro de este estilo reside en elhecho que permite evaluar exactamente el numero mínimo ...
    • Estimate of influenza cases using generalized linear, additive and mixed models 

      Oviedo de La Fuente, Manuel; Domínguez García, Angela; Muñoz Gracia, María del Pilar (Landes Bioscience, 2015-01-01)
      Article
      Open Access
      We investigated the relationship between reported cases of influenza in Catalonia (Spain). Covariates analyzed were: population, age, data of report of influenza, and health region during 2010-2014 using data obtained from ...
    • Estimation of dynamic models using kernel density 

      Font, X; Muñoz Gracia, María del Pilar; Martí Recober, Manuel (2002-08)
      Conference lecture
      Restricted access - publisher's policy
      The objective of this work is to present a simple approach to deal with a dynamic model without imposing any assumptions on the error distribution. Using a state-space representation the model does not need any optimization ...
    • Estimation of the number of cases of meningococcical disease in Barcelona by means capture-recapture methodology 

      Muñoz Gracia, María del Pilar; Orcau Palau, Angels; Pañella, Helena (1998-08)
      Conference lecture
      Open Access
      This study is aimed at estimating the number of cases fo meningococcical disease that appeared in Barcelona between the years 1993 and 1994. We develop long-linear models for capture-recapture methods when there are more ...
    • ¿Existe relación entre los mercados de bonos y acciones en la Eurozona? 

      Márquez Cebrian, M. Dolores; Muñoz Gracia, María del Pilar; Soriano, Pilar (2010)
      Conference report
      Restricted access - publisher's policy
      El objetivo de este trabajo es investigar, en la Eurozona, la relación existente entre los mercados de bonos y acciones, conocer y cuantificar dicha relación es de vital importancia en la gestión de riesgos. Con este ...
    • Formal assessment of an innovative web-based tool designed to improve student performance in statistics 

      González Alastrué, José Antonio; Jover, Lluís; Cobo Valeri, Erik; Muñoz Gracia, María del Pilar (2006-07)
      Conference report
      Open Access
      We have developed a web-based tool, called e-status, that is able to generate individually different statistical or mathematical problems and to correct the students´ answers. The tool is well appreciated by the students ...
    • Geographical differences in whooping cough in Catalonia, Spain, from 1990 to 2010 

      Crespo, Inma; Soldevila, Nuria; Muñoz Gracia, María del Pilar; Godoy, Pere; Carmona, Gloria; Domínguez García, Angela (2014-03)
      Article
      Open Access
      Whooping cough is a communicable disease whose incidence has increase d in recent years in some countries with vaccination. Since 1981, in Catalonia (Spain), cases must be reported to the Public Health Department. In 1997, ...
    • Improving electricity market price scenarios by means of forecasting factor models 

      Muñoz Gracia, María del Pilar; Corchero García, Cristina; Heredia, F.-Javier (Francisco Javier) (2009-07)
      Working paper
      Open Access
      In liberalized electricity markets, generation Companies must build an hourly bid that is sent to the market operator. The price at which the energy will be paid is unknown during the bidding process and has to be forecast. ...