Now showing items 21-36 of 36

    • Nonlinear loads model for harmonics flow prediction, using multivariate regression 

      Lamich Arocas, Manuel; Balcells Sendra, Josep; Corbalán Fuertes, Montserrat; Griful Ponsati, Eulàlia (Institute of Electrical and Electronics Engineers (IEEE), 2017-06)
      Article
      Open Access
      This paper describes a method for obtaining a model of a single or a set of nonlinear loads (NLL) connected to a certain point of an electrical network. The basic assumption is that the network supplying the NLL has ...
    • Passive sampling in reproducing kernel Hilbert spaces using leverage scores 

      Giménez Febrer, Pedro Juan; Pagès Zamora, Alba Maria; Santamaria Caballero, Ignacio (2022-10-01)
      Article
      Open Access
      This paper deals with the selection of the training dataset in kernel-based methods for function reconstruction, with a focus on kernel ridge regression. A functional analysis is performed which, in the absence of noise, ...
    • Predicting web server crashes: a case study in comparing prediction algorithms 

      Alonso López, Javier; Torres Viñals, Jordi; Gavaldà Mestre, Ricard (IARIA, 2009)
      Conference report
      Open Access
      Traditionally, performance has been the most important metrics when evaluating a system. However, in the last decades industry and academia have been paying increasing attention to another metric to evaluate servers: ...
    • Regression models with an interval-censored covariate 

      Langohr, Klaus (Universitat Politècnica de Catalunya, 2004-06-16)
      Doctoral thesis
      Open Access
      El análisis de supervivencia trata de la evaluación estadística de variables que miden el tiempo transcurrido hasta un evento de interés. Una particularidad que ha de considerar el análisis de supervivencia son datos ...
    • Regressió logística penalitzada 

      Muñoz Aragón, Montserrat (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2020-06)
      Bachelor thesis
      Open Access
      [cat] Actualment, un dels temes d’interès en el món de l’estadística és el Big Data. A l’hora d’estimar un model estadístic amb moltes variables poden sorgir alguns problemes com la multicol·linealitat i la manca d’eficiència, ...
    • Regressió quantílica i quantílica logística: Una aproximació a l’economia i l’estadística 

      Franquet Fàbregas, Josep (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2020-06)
      Bachelor thesis
      Open Access
      [cat] La part introductòria del treball està formada per la introducció, la revisió de la literatura i la metodologia. En aquesta part introductòria, es justifica el tema (regressió quantílica i quantílica logística), es ...
    • Regularización en problemas lineales de regresión: Una visión estadística y económica aplicada a datos de desarrollo humano 

      Garnica Barco, Álvaro (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2021-01)
      Bachelor thesis
      Open Access
      En este trabajo se estudian diferentes métodos de regularización aplicados a problemas predictivos de regresión. Para ello se utiliza una base de datos relativa a indicadores de desarrollo mundial y se enseñan los pasos ...
    • Search strategies guided by the evidence for the selection of basis functions in regression 

      Barrio Moliner, Ignacio; Romero Merino, Enrique; Belanche Muñoz, Luis Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2007)
      Conference report
      Open Access
      This work addresses the problem of selecting a subset of basis functions for a model linear in the parameters for regression tasks. Basis functions from a set of candidates are explicitly selected with search methods coming ...
    • Spanish multicenter normative studies (Neuronorma Project): norms for the abbreviated Barcelona test 

      Blesa, Rafael; Fernández, Manuel; Frank-García, Anna; Martínez-Parra, Carlos; Antúnez, Carmen; Sagrario Barquero, María; Robles, Alfredo; Quintana, María; Peña-Casanova, Jordi; Sánchez-Benavides, Gonzalo; Langohr, Klaus; Manero, Rosa M.; Aguilar, Miguel; Badenes, Dolors; Molinuevo, José Luis (2011-03-02)
      Article
      Restricted access - publisher's policy
      The abbreviated Barcelona Test (a-BT) is an instrument widely used in Spain and Latin American countries for general neuropsychological assessment. The purpose of the present study was to provide new norms for the a-BT as ...
    • Statistical methods in Kansei engineering studies 

      Marco Almagro, Lluís (Universitat Politècnica de Catalunya, 2011-12-15)
      Doctoral thesis
      Open Access
      Aquesta tesi doctoral tracta sobre Enginyeria Kansei (EK), una tècnica per traslladar emocions transmeses per productes en paràmetres tècnics, i sobre mètodes estadístics que poden beneficiar la disciplina. El propòsit ...
    • Statistical techniques in predicting the winners of professional women tennis in grand slams between the years 2001-2022 

      Dayekh, Hattem (Universitat Politècnica de Catalunya, 2022-06-28)
      Master thesis
      Open Access
      Statistical techniques have been improved over the years and can now be applied to practically anything, including sports. Sports analytics are a hot topic right now due to the huge amount of data available for analysis. ...
    • Survival data analysis with heavy-censoring and long-term survivors 

      López Segovia, Lucas (Universitat Politècnica de Catalunya, 2014-06-10)
      Doctoral thesis
      Open Access
      The research developed in this thesis has been motivated by two datasets, which are introduced in Chapter 2, one concerning the mortality of calves from birth to weaning while the other refers to survival of patients ...
    • Survival of HIV - Infected Injection Drug Users (IDUs) in the highly active antiretroviral therapy era, relative to sex - and age - specific survival of HIV - uninfected IDUs 

      Muga, Roberto; Langohr, Klaus; Tor, Jordi; Sanvisens, Arantza; Serra, Isabel; Rey-Joly, Celestino; Muñoz, Álvaro (2007-08)
      Article
      Open Access
      Background. In the era of highly active antiretroviral therapy (HAART), it remains unclear whether human immunodeficiency virus (HIV)–infected injection drug users (IDUs) have durations of survival similar to those for ...
    • Trends in ozone concentrations in the Iberian Peninsula by quantile regression and clustering 

      Borrego, Carlos; Miranda, A.I.; Monteiro, Alexandra; Carvalho, A.; Ribeiro, I; Scotto, M.; Barbosa, S.; Alonso, A.; Baldasano Recio, José María; Pay Pérez, M. Teresa (2012-09-01)
      Article
      Restricted access - publisher's policy
      In this paper, 10-years of ozone (O3) hourly concentrations collected over the period 2000e2009 in the Iberian Peninsula (IP) are analyzed using records from 11 background sites. All the selected monitoring stations ...
    • Tria de variables per a un algoritme basat en regressió logística 

      Sánchez Martínez, Guillem (Universitat Politècnica de Catalunya, 2017-06-15)
      Bachelor thesis
      Restricted access - confidentiality agreement
    • Value creation in European M&A transactions 

      Alsina Sola, Carles Javier (Universitat Politècnica de Catalunya, 2012)
      Master thesis (pre-Bologna period)
      Open Access
      The Mergers and Acquisitions market represents an important aspect on the corporate environment. Therefore it is not strange that one of the main concerns for acquirer’s shareholders has been whether ...