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Browsing Revista Colombiana de Estadística by Title
Now showing items 1-20 of 524
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A bayesian approach to parameter estimation in simplex regression model: a comparison with beta regression
Some variables are restricted to the open interval (0; 1) and several methodshave been developed to work with them under the scheme of the regressionanalysis. Most of research consider maximum likelihood methods andthe use ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Bimodal Extension of the Generalized Gamma Distribution
A bimodal extension of the generalized gamma distribution is proposed by using a mixing approach. Some distributional properties of the new distribution are investigated. The maximum likelihood (ML) estimators for the ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Bivariate Model based on Compound Negative Binomial Distribution
A new bivariate model is introduced by compounding negative binomial and geometric distributions. Distributional properties, including joint, marginal and conditional distributions are discussed. Expressions for the product ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A comment about estimable functions in linear models with non estimable constraints
In the Searle's (1987) book, Linear Models for Unbalanced Data, a characterization of the estimable functions in linear models with non estimable constraints is presented. In this informal paper, I indicate another ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A comparative study of the Gini coefficient estimators based on the linearization and U-statistics Methods
In this paper, we consider two well-known methods for analysis of the Gini index, which are U-statistics and linearization for some incomedistributions. In addition, we evaluate two different methods for some properties ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Graphical Diagnostic Test for Two-Way Contingency Tables
We propose and illustrate a new graphical method to perform diagnostic analyses in two-way contingency tables. In this method, one observation is added or removed from each cell at a time, whilst the other cells are held ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Methodology for Biplots Based on Bootstrapping with R
A biplot is a graphical representation of two-mode multivariate data based on markers for rows and columns often provided in a two-dimensional space. These markers define parameters that help to interpret goodness of fit, ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Multi-Agent Proposal for the Resolution of BIBD instances
The problem with designing balanced incomplete blocks (BIBD) is enclosed within the combinatorial optimization approach that has been extensively used in experimental design. The present proposal addresses thi problem by ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A multi-stage almost ideal demand system: the case of beef demand in colombia
The main objective in this paper is to obtain reliable long-term and shorttermelasticities estimates of the beef demand in Colombia using quarterlydata since 1998 until 2007. However, complexity on the decision process ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A new difference-cum-exponential type estimator of finite population mean in simple random sampling
los estimadores al estimar los parámetros poblacionales desconocidos.En este trabajo, se propone un nuevo tipo de diferencia-cum-exponencialestimador de la población finita implicar el uso de información auxiliar enmuestreo ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A new extension of the exponential distribution
En el presente paper se considera una extensión de la distribución exponencialbasada en mezclas de distribuciones positivas. Estudiamos lasprincipales propiedades de esta nueva distribución, con especial énfasis ensus ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A new method for detecting significant p-values with applications to genetic data
Se describe una nuevo método para la detección de valores p significativos.Este método, basado en el m-ésimo estadístico de orden de la distribuciónU(0; 1), es adecuado en casos en los que se realizan m ! 1 pruebas dehipótesis ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Note on Generalized Exponential Type Estimator for Population Variance in Survey Sampling
Recently a new generalized estimator for population variance using information on the auxiliary variable has been introduced by Asghar, Sanaullah and Hanif (2014). In that paper there was some inaccuracy in the bias ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A porpósito de los modelos sobre café en colombia
Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Review of Estimation of Key Parameters and Lead Time in Cancer Screening
Early detection combined with effective treatments are the only ways to fight against cancer, and cancer screening is the primary technique for early detection. Although mass cancer screening has been carried out for ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A single queue with mutually replacing m servers
Customers arriving in a Poisson stream are served one by one exponentially by the m servers 81, 82, ... .S,«. A server who has just completed a service either continues the next service or is replaced by another server. ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Study of Cumulative Quantity Control Chart for a Mixture of Rayleigh Model under a Bayesian Framework
This study deals with the cumulative charting technique based on a simple and a mixture of Rayleigh models. The respective charting schemes are referred as the SRCQC-chart and the MRCQC-chart. These are stimulated from ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Trinomial Difference Distribution
A trinomial difference distribution is defined and its distributional properties are illustrated. This distribution present the binomial difference distribution as a special case. The moment estimators and maximum ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A Two Parameter Discrete Lindley Distribution
In this article we have proposed and discussed a two parameter discrete Lindley distribution. The derivation of this new model is based on a two step methodology i.e. mixing then discretizing, and can be viewed as a ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
Accounting for Model Selection Uncertainty: Model Averaging of Prevalence and Force of Infection Using Fractional Polynomials
In most applications in statistics the true model underlying data generation mechanisms is unknown and researchers are confronted with the critical issue of model selection uncertainty. Often this uncertainty is ignored ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística.
