Browsing by Subject "Multivariate analysis"
Now showing items 1-20 of 209
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A Bayesian approach to cluster analysis
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1988)
Article
Open AccessA 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
(Institut d'Estadística de Catalunya, 1998)
Article
Open AccessMicroaggregation 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
(2014-09-01)
Article
Restricted access - publisher's policyCognitive 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
(Universitat Politècnica de Catalunya / Universitat de Barcelona, 2020-10)
Master thesis
Restricted access - author's decisionThe 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
(Institut d'estadística de Catalunya, 1994)
Article
Open AccessThe 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
(Institut d'Estadística de Catalunya, 2007)
Article
Open AccessWe 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
(Institut d'Estadística de Catalunya, 1995)
Article
Open AccessIn 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
(Institut d'Estadística de Catalunya, 1993)
Article
Open AccessFor 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.
(Institut d'Estadística de Catalunya, 2006)
Article
Open AccessWe 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
(Universitat Politècnica de Catalunya, 2009-06-23)
Master thesis (pre-Bologna period)
Open AccessEl 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
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1985-09)
Article
Open AccessEste 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
(Elsevier Science Ltd., 2011)
Article
Restricted access - publisher's policyWe 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
(Springer, 2016)
Part of book or chapter of book
Restricted access - publisher's policyAbstract 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
(Institut d'Estadística de Catalunya, 2003)
Article
Open AccessThis 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
(2013)
Conference report
Open AccessSince 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
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1981-03)
Article
Open AccessLa 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
(Universitat Politècnica de Catalunya / Universitat de Barcelona, 2019-10)
Master thesis
Restricted access - author's decisionIn 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, ... -
Analysis of synoptic patterns in relationship with severe rainfall events in the Ebre Observatory (Catalonia)
(2018-03-23)
Article
Open AccessThe study has obtained a classification of the synoptic patterns associated with a selection of extreme rain episodes registered in the Ebre Observatory between 1905 and 2003, showing a return period of not less than 10 ... -
Anàlisi de dades procedents de telefonia mòbil per la modelització de la demanda de transport
(Universitat Politècnica de Catalunya / Universitat de Barcelona, 2018-06)
Master thesis
Open AccessEls 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 dades sobre la inspecció tècnica de vehicles entre el Novembre de 1996 i el Juliol de 1999
(Universitat Politècnica de Catalunya, 2000-06)
Master thesis (pre-Bologna period)
Open AccessAl final els objectiu de l'estudi són: a) determinar si els vehicles que puntualment es sotmeten a la inspecció tecnica obligatoria presenten menys problematica que els que es retarden en el seu compliment. b) si existeixen ...
