Exploració per tema "Classificació AMS::62 Statistics::62H Multivariate analysis"
Ara es mostren els items 1-20 de 236
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A Bayesian approach to cluster analysis
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1988)
Article
Accés obertA 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 class of goodness-of-fit tests for circular distributions based on trigonometric moments
(Institut d'Estadística de Catalunya, 2019-12-17)
Article
Accés obertWe propose a class of goodness–of–fit test procedures for arbitrary parametric families of circular distributions with unknown parameters. The tests make use of the specific form of the characteristic function of the family ... -
A comparative study of microaggregation methods
(Institut d'Estadística de Catalunya, 1998)
Article
Accés obertMicroaggregation 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 contingency table approach based on nearest neighbour relations for testing self and mixed correspondence
(Institut d'Estadística de Catalunya, 2018-12-21)
Article
Accés obertNearest neighbour methods are employed for drawing inferences about spatial patterns of points from two or more classes. We introduce a new pattern called correspondence which is motivated by (spatial) niche/habitat ... -
A data science approach for spatiotemporal modelling of low and resident air pollution in Madrid (Spain): implications for epidemiological studies
(2019-05-01)
Article
Accés obertModel developments to assess different air pollution exposures within cities are still a key challenge in environmental epidemiology. Background air pollution is a long-term resident and low-level concentration pollution ... -
A genome-wide association study of cattle feed efficiency
(Universitat Politècnica de Catalunya / Universitat de Barcelona, 2020-10)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autorThe 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
Accés obertThe 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 preliminary taxonomy and a standard knowledge base for mental-health system indicators in Spain
(2010-11)
Article
Accés obert -
A recursion formula for expected negative and positive powers of the central Wishart distribution
(Institut d'Estadística de Catalunya, 2007)
Article
Accés obertWe 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
Accés obertIn 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
Accés obertFor 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
Accés obertWe 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. -
Advantages of combining AI and statistic for knowledge discovery on functional disability: multivariate analysis of assessment scales using clustering based on rules
(2009-12)
Article
Accés obertIn Europe, and other developed areas, senior citizens are a fast growing part of population. This increases proportion of disabled persons and proportion of persons with reduced quality of life. The concept of disability ... -
Algoritme EpiFRIenDs: Recerca de punts calents de malària
(Universitat Politècnica de Catalunya, 2023-01)
Projecte Final de Màster Oficial
Accés restringit per acord de confidencialitatEn aquesta tesi s’ha desenvolupat un algoritme anomenat ”Epidemiological Foci Relating Infections by Distance”(EpiFRIenDs) orientat a la detecció punts calents (hotspots) de malària a partir d’unes dades geolocalitzades ... -
Algunos aspectos acerca de la construcción de distribuciones multivariantes con marginales dadas
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1985-09)
Article
Accés obertEste 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 ... -
Alternate-wrapped circular distributions
(Institut d'Estadística de Catalunya, 2022-12-20)
Article
Accés obertTo generate a circular distribution, we use the alternate-wrapping technique (unlike the usual wrapping), by wrapping in the alternate directions, after each single-wrapping. The resulting distribution is called alternate-wrapped ... -
An approach based on simulation and optimisation for the intermodal dispatching of public transport and ride-pooling services
(2023-03-16)
Article
Accés obertThis paper provides a simulation and optimisation-based system to combine public transport (PT) with ride-pooling services (RP). According to the International Transport Forum (ITF), the RP could be established as a feeder ... -
An empirical evaluation of five small area estimators
(Institut d'Estadística de Catalunya, 2003)
Article
Accés obertThis 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 ... -
Analyse de structures de données dynamiques et histoires de fichiers
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1981-03)
Article
Accés obertLa 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, ... -
Analysing gendered mobility patterns in Barcelona through spatiotemporal segmentation
(Elsevier, 2022-08-24)
Article
Accés obertCitizens take part in different activities to satisfy their needs, to invest in their socio-economic progress, participate in social and health activities that improve their well-being. However, activity participation is ...