Now showing items 21-40 of 45

  • Joint modelling analysis of prostate cancer incidence: frequentist and bayesian approaches 

    Piulachs, Xavier; Serrat Piè, Carles; Rué, Montserrat; Armero, Carmen; Forte, Anabel; Perpiñán, Héctor; Luján, Marcos; Páez, Álvaro (2013)
    Conference lecture
    Open Access
    Prostate specific antigen (PSA) is a biomarker for prostate cancer (PCa) that is widely used for PCa screening. Using a database of 2415 men included in the Spanish screening arm of the ERSPC Study, we will use joint ...
  • Joint modelling of two sequential times to event with longitudinal information 

    Huertas, Jaime-Abel; Gómez Melis, Guadalupe; Serrat Piè, Carles (2011)
    Conference lecture
    Open Access
    In survival analysis, the lifetimes may be observed in some speci¯ed order, where the time to event Tk, cannot be observed until T1; :::; Tk¡1 have been observed. The present work proposes a joint model of two sequential ...
  • Joint models para el análisis conjunto de datos longitudinales y de supervivencia. Aplicación a la medida de asociación entre el peso y la mortalidad en el estudio PREDIMED 

    Gorostiza López De Subijana, Ania (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2018-10)
    Master thesis
    Restricted access - author's decision
    En este trabajo se ha analizado la asociación entre el peso y la mortalidad usando datos del estudio PREDIMED (Prevención con Dieta Mediterránea), en el que el peso de los participantes se midió repetidamente a lo largo ...
  • Missing data in clinical trials 

    Marinelli, Marcella (Universitat Politècnica de Catalunya, 2011-07)
    Master thesis
    Open Access
    There is a need to plan an appropriate statistical analysis of missing data for researchers working in clinical trials in HIV. Based on it, the main objectives of this thesis are: - Review the different typologies of ...
  • Modeling pseudo-observations with covariate dependent censoring: robustness of the method against misspecified censoring models 

    Schoenenberger López, Andreu (Universitat Politècnica de Catalunya / Universitat de Barcelona / Københavns Universitet (KU), 2018-01)
    Master thesis
    Open Access
    Covenantee:  Københavns universitet
    The so called pseudo-observations in survival analysis were introduced by recent studies that reviewed this method when estimating different parameters using regressions models (Andersen and Perme, Stat. Meth. Med. Res., ...
  • Modelling consumer credit risk via survival analysis 

    Cao, Ricardo; Vilar Fernández, Juan Manuel; Devía, A. (Institut d'Estadística de Catalunya, 2009)
    Article
    Open Access
    Credit risk models are used by financial companies to evaluate in advance the insolvency risk caused by credits that enter into default. Many models for credit risk have been developed over the past few decades. In this ...
  • El modelo aditivo de Aalen. Una alternativa al modelo de riesgos proporcionales 

    Alayo Bueno, Itxaso (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2016-06)
    Master thesis
    Open Access
    El modelo de Cox, basado en la suposición de que las funciones de riesgo entre individuos expuestos a factores distintos se mantiene constante a lo largo del tiempo, es el modelo de regresión más utilizado para tiempos de ...
  • Modelos mixtos de riesgo a tiempo discreto para la estimación del riesgo de falsos positivos en el cribado mamográfico 

    Román Expósito, Rubén (Universitat Politècnica de Catalunya, 2011-02)
    Master thesis
    Open Access
    Se dispone de información retrospectiva de 10 programas de cribado poblacionales de cáncer de mama. Se estimó el riesgo de tener un falso-positivo en el cribado mamográfico asociado a cada convocatoria de la mujer. Se ...
  • Models per a temps de supervivència discrets 

    Vázquez Fariñas, Ana (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2015-06)
    Master thesis
    Open Access
    El temps fins un esdeveniment està mesurat en una escala contínua, però per diverses raons ens podem trobar amb temps mesurats de forma discreta. En aquest treball es comparen els models per temps discrets: el model de ...
  • New aging properties of the Clayton-Oakes model based on multivariate dispersion 

    Arias-Nicolás, José Pablo; Mulero, Julio; Núñez-Barrera, Olga; Suárez-Llorens, Alfonso (Institut d'Estadística de Catalunya, 2010)
    Article
    Open Access
    In this work we present a recent definition of Multivariate Increasing Failure Rate (MIFR) based on the concept of multivariate dispersion. This new definition is an extension of the univariate characterization of IFR ...
  • One inspection is not enough to estimate durability in building : a simulation study 

    Serrat Piè, Carles (2011)
    Conference lecture
    Open Access
    Decisions about intervention in existing buildings are generally based on information gathered from inspections, as a systematic tool for the identification of some injury in buildings. The goal of this research is to ...
  • On the selection of significant variables in a model for the deteriorating process of facades 

    Serrat Piè, Carles; Gibert Armengol, Vicente; Casas Rius, Joan Ramon; Rapinski, Jacek (Institute of Physics (IOP), 2017)
    Conference lecture
    Open Access
    Serrat and Gibert (2011) introduced the use of survival analysis techniques for the study of time-to-failure in the façades of a building stock. Recently, those techniques have been implemented in a predictive system that ...
  • Predicting the remaining time to achieve the required number of needed patients or events in an ongoing clinical trial 

    Castellà Canals, Gerard (Universitat Politècnica de Catalunya, 2016-06)
    Master thesis
    Restricted access - confidentiality agreement
    Covenantee:  Hospital Universitari Arnau de Vilanova
  • Quantile estimation of the rejection distribution of food products integrating assessor values and interval-censored consumer data 

    Langohr, Klaus; Gómez Melis, Guadalupe; Hough, Guillermo (2013-12)
    Article
    Restricted access - publisher's policy
    Fitting parametric survival models with interval-censore d data is a common task in survival analysis and implemented in many statistical software pack ages. Here, we present a novel approach to fit such models if the ...
  • Relative efficiency between two tests 

    Bofill Roig, Marta (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2016-06)
    Master thesis
    Restricted access - author's decision
    The choice of the primary endpoint is an important issue when designing a clinical trial. The motivation of this Master thesis is to develop a methodology based on the Asymptotic Relative Efficiency (ARE) that discerns ...
  • Review of multivariate survival data 

    Gómez Melis, Guadalupe; Calle Rosingana, M. Luz; Serrat Piè, Carles; Espinal Berenguer, Anna (2004-09)
    External research report
    Open Access
    This paper reviews some of the main contributions in the area of multivariate survival data and proposes some possible extensions. In particular, we have concentrated our search and study on those papers that are relevant ...
  • Simultaneous marginal survival estimators when doubly censored data is present 

    Julià, Olga; Gómez Melis, Guadalupe (2010-10)
    Article
    Restricted access - publisher's policy
    A doubly censoring scheme occurs when the lifetimes T being measured, from a well-known time origin, are exactly observed within a window [L,R] of observational time and are otherwise censored either from above (right-censored ...
  • Study of the therapeutic drug adherence in patients with ischemic cardiopathology 

    Carbonell Mirabent, Pere Josep (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2015-06)
    Master thesis
    Open Access
    The present study is divided into two different parts. The first part will be devoted to detect risk factors for the non adherence to treatment in patients with isquemic cardiopathology. The aim of the second part of the ...
  • Supervivència de pacients amb càncer de pròstata localitzat amb models de riscos proporcionals 

    Viladrich Sarret, Mercè (Universitat Politècnica de Catalunya, 2015-06)
    Master thesis (pre-Bologna period)
    Open Access
    Les dades d'aquest treball provenen d'un estudi de seguiment de 766 pacients diagnosticats de càncer de pròstata localitzat i reclutats consecutivament en 10 departaments hospitalaris espanyols. Per tal de comparar ...
  • Survival analysis techniques applied to building maintenance 

    Serrat Piè, Carles; Gibert Armengol, Vicente; Jordana Riba, Francisco de Paula (Escuela Universitaria de Arquitectura Técnica . Universidad Politécnica de Madrid, 2009-06-30)
    Conference lecture
    Restricted access - publisher's policy
    This paper has two main objectives: On the one hand, we want to introduce survival analysis techniques for use in building maintenance and, on the other hand, to apply this methodology to analyzing a large building stock ...