Now showing items 1-20 of 191

    • A Bayesian approach to cluster analysis 

      Bernardo, José Miguel; Girón González-Torre, Francisco Javier (Universitat Politècnica de Barcelona. Centre de Càlcul, 1988)
      Article
      Open Access
      A general probabilistic model for describing the structure of statistical problems known under the generic name of cluster analysis, based on finite mixtures of distributions, is proposed. We analyse the theoretical and ...
    • A comparative study of microaggregation methods 

      Mateo Sanz, Josep Maria; Domingo Ferrer, Josep (Institut d'Estadística de Catalunya, 1998)
      Article
      Open Access
      Microaggregation is a statistical disclosure control technique for microdata. Raw microdata (i.e. individual records) are grouped into small aggregates prior to publication. Each aggregate should contain at least k records ...
    • A data mining approach to identify cognitive NeuroRehabilitation Range in Traumatic Brain Injury patients 

      García Rudolph, Alejandro; Gibert, Karina (2014-09-01)
      Article
      Restricted access - publisher's policy
      Cognitive rehabilitation (CR) treatment consists of hierarchically organized tasks that require repetitive use of impaired cognitive functions in a progressively more demanding sequence. Active monitoring of the progress ...
    • A genome-wide association study of cattle feed efficiency 

      Iranzo Ribera, Eva (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2020-10)
      Master thesis
      Restricted access - author's decision
      The goal of this project is to study the relationship between the genotype (SNPs) and phenotype (feed efficiency, FE) of a cow population of size n = 608. In order to achieve this goal, a descriptive analysis of the genetic ...
    • A model for credit scoring: an application of discriminant analysis 

      Artís Ortuño, Manuel; Guillén, Montserrat; Martínez, José M.ª (Institut d'estadística de Catalunya, 1994)
      Article
      Open Access
      The application of statistical techniques in decision making, and more specifically for classification requirements, has proved to be adequate in the context of financial problems. In this study, we present the methodology ...
    • A recursion formula for expected negative and positive powers of the central Wishart distribution 

      Neudecker, Heinz (Institut d'Estadística de Catalunya, 2007)
      Article
      Open Access
      We use Haff’s fundamental identity to express the expectation of Sp in lower-order terms, where S follows the central Wishart distribution.
    • A review of canonical coordinates and an alternative to correspondence analysis using Hellinger distance 

      Rao, C. Radhakrishna (Institut d'Estadística de Catalunya, 1995)
      Article
      Open Access
      In this paper a general theory of canonical coordinates is developed for reduction of dimensionality in multivariate data, assessing the loss of information and plotting higher dimensional data in two or three dimensions ...
    • A simple statistic to test generalized palindromic symmetry model in a 4 x 4 contingency table 

      Tomizawa, Sadao (Institut d'Estadística de Catalunya, 1993)
      Article
      Open Access
      For a 4x4 contingency table, this note gives a simple statistic to test the goodness-of-fit of the generalized palindromic symmetry (GPS) model considered by McCullagh (1978). Also an asymptotic confidence interval for a ...
    • About one problem of Bernoulli and Euler from the theory of statistical estimation. 

      Nikulin, Mikhaïl (Institut d'Estadística de Catalunya, 2006)
      Article
      Open Access
      We consider some results by D. Bernoulli and L. Euler on the method of maximum likelihood in parametric estimation. The statistical analysis is made by considering a parametric family with a shift parameter.
    • Algoritmos de clustering basados en el concepto de líder 

      Hernández González, Jerónimo (Universitat Politècnica de Catalunya, 2009-06-23)
      Master thesis (pre-Bologna period)
      Open Access
      El objetivo principal de este proyecto final de carrera, que lleva por nombre “Algoritmos de clustering basados en el concepto de Líder”, consiste en obtener diferentes versiones de algoritmos de clustering modificando ...
    • Algunos aspectos acerca de la construcción de distribuciones multivariantes con marginales dadas 

      Sánchez Algarra, Pedro (Universitat Politècnica de Barcelona. Centre de Càlcul, 1985-09)
      Article
      Open Access
      Este trabajo discute el problema de la construcción de distribuciones multivariantes donde las distribuciones marginales han sido fijadas. Se estudian dos casos. En el primer caso se analiza la construcción y propiedades ...
    • An Algorithm for k-Anonymous Microaggregation and Clustering Inspired by the Design of Distortion-Optimized Quantizers 

      Forné Muñoz, Jorge; Soriano Ibáñez, Miguel (Elsevier Science Ltd., 2011)
      Article
      Restricted access - publisher's policy
      We present a multidisciplinary solution to the problems of anonymous microaggregation and clustering, illustrated with two applications, namely privacy protection in databases, and private retrieval of location-based ...
    • An application of the isometric log-ratio transformation in relatedness research 

      Graffelman, Jan; Galván Femenía, Iván (Springer, 2016)
      Part of book or chapter of book
      Restricted access - publisher's policy
      Abstract Genetic marker data contains information on the degree of relatedness of a pair of individuals. Relatedness investigations are usually based on the extent to which alleles of a pair of individuals match over a set ...
    • An empirical evaluation of five small area estimators 

      Costa, Àlex; Satorra, A.; Ventura, Eva (Institut d'Estadística de Catalunya, 2003)
      Article
      Open Access
      This paper compares five small area estimators. We use Monte Carlo simulation in the context of both artificial and real populations. In addition to the direct and indirect estimators, we consider the optimal composite ...
    • An ensemble approach to estimate the fault-time instant 

      Alippi, Cesare; Boracchi, Giacomo; Puig Cayuela, Vicenç; Roveri, Manuel (2013)
      Conference report
      Open Access
      Since systems are prone to faults, fault detection and isolation are essential activities to be considered in safety-critical applications. In this direction, the availability of a sound estimate of the time instant the ...
    • Analyse de structures de données dynamiques et histoires de fichiers 

      Flajolet, Philippe; Puech, Claude (Universitat Politècnica de Barcelona. Centre de Càlcul, 1981-03)
      Article
      Open Access
      La théorie des histoires de fichiers permet d'analyser le coût de suites d'opérations portant sur des fichiers dont la taille varie avec le temps; elle permet donc de comparer, vis à vis de differentes mesures du coût, ...
    • Analysis of calf growth with compositional mixed models 

      Ortuzar Fernández, Iban (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2019-10)
      Master thesis
      Restricted access - author's decision
      In this master's thesis we combine techniques from the field of Compositional Data Analysis (CoDA) with mixed-effects models to study the relationship between dairy calves' growth and their amino acid compositon in blood, ...
    • Anàlisi de dades procedents de telefonia mòbil per la modelització de la demanda de transport 

      Gasparín Casajust, Francesc (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2018-06)
      Master thesis
      Open Access
      Els models de transport són eines necessàries per a la planificació del transport, sobretot a les ciutats mitjanes i grans. També permeten fer prediccions sobre futurs escenaris de sistemes de transport. Dins de les ...
    • Anàlisi de matrius quadrades no simètriques: un enfocament integral usant anàlisi de correspondències 

      Daunis i Estadella, Josep; Aluja Banet, Tomàs; Thió Fernández de Henestrosa, Santiago (Institut d'Estadística de Catalunya, 2002)
      Article
      Open Access
      En este artículo se presenta una propuesta integrada de análisis de matrices cuadradas no simétricas mediante análisis de correspondencias. En ella se han integrado las dos principales familias de metodologías que proponen ...
    • Anàlisi multivariant de sèries temporals 

      Mazaira Font, Ferran-Antonio (Universitat Politècnica de Catalunya, 2012-06)
      Master thesis (pre-Bologna period)
      Open Access
      L'objectiu d'aquest projecte és analitzar tant des d'un punt teòric com aplicat el models de sèries temporals multivariants VARMA. la identificació i diagnosis d'aquests models no és trivial donada la seva complexitat, ...