Now showing items 1-20 of 524

    • Simultaneous Confidence Bands for the Estimation of Expected Discounted Warranty Costs for Coherent Systems under Minimal Repair 

      Lopera Gómez, Carlos Mario; Gónzalez Álvarez, Nelfi Gertrudis
      This paper develops simultaneous confidence bands using computer intensive methods based on resampling, for the expected discounted warranty costs in coherent systems under physical minimal repair, that is, when the system ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Estimating dynamic Panel data. A practical approach to perform long panels. 

      Labra Lillo, Romilio; Torrecillas, Celia
      Panel data methodology is one of the most popular tools for quantitative analyses in the field of social sciences, particularly on topics related to economics and business. This technique allows us simultaneously addressing ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • A Bivariate Model based on Compound Negative Binomial Distribution 

      Omair, Maha Ahmad; AlMuhayfith, Fatimah E; Alzaid, Abdulhamid A
      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. 
    • The Odd Log-Logistic Dagum Distribution: Properties and Applications 

      Domma, Filippo; Eftekharian, Abbas; Afify, Ahmed; Alizadeh, Morad; Ghosh, Indranil
      This paper introduces a new four-parameter lifetime model called the odd log-logistic Dagum distribution. The new model has the advantage of being capable of modeling various shapes of aging and failure criteria. We derive ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Estimating the Gumbel-Barnett copula parameter of dependence 

      Portilla Yela, Jennyfer; Tovar Cuevas, José Rafael
      In this paper, we developed an empirical evaluation of four estimation procedures for the dependence parameter of the Gumbel-Barnett copula obtained from a Gumbel type I distribution. We used the maximum likelihood, moments ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Local dependence in bivariate copulae with Beta marginals 

      Koutoumanou, Eirini; Wade, Angie; Cortina-Borja, Mario
      The local dependence function (LDF) describes changes in the correlation structure of continuous bivariate random variables along their range. Bivariate density functions with Beta marginals can be used to model jointly a ...
      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 

      Mirzaei, Shahryar; Mohtashami Borzadaran, Gholam Reza; Amini, Mohammad
      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. 
    • Finite mixture of compositional regression with gaussian errors 

      Shimizu, Taciana; Louzada, Francisco; Suzuki, Adriano
      In this paper, we consider to evaluate the efficiency of volleyball players according to the performance of attack, block and serve, but considering the compositional structure of the data related to the fundaments. The ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Entropy Estimation From Ranked Set Samples With Application to Test of Fit 

      Zamanzade, Ehsan; Mahdizadeh, Mahdi
      This article deals with entropy estimation using ranked set sampling (RSS). Some estimators are developed based on the empirical distribution function and its nonparametric maximum likelihood competitor. The suggested ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Classical and Bayesian Estimation of Reliability in Multicomponent Stress-Strength Model Based on Weibull Distribution 

      Kizilaslan, Fatih; Nadar, Mustafa
      In this study, we consider a multicomponent system which has k independent and identical strength components X1,...,Xk and each component is exposed to a common random stress Y when the underlying distributions are Weibull. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Cointegration Vector Estimation by DOLS for a Three-Dimensional Panel 

      Melo-Velandia, Luis Fernando; León, John Jairo; Saboyá, Dagoberto
      This paper extends the results of the dynamic ordinary least squares cointegration vector estimator available in the literature to a three-dimensional panel. We use a balanced panel of N and M lengths observed over T periods. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Estimation and Testing in One-Way ANOVA when the Errors are Skew-Normal 

      Celik, Nuri; Senoglu, Birdal; Arslan, Olcay
      We consider one-way analysis of variance (ANOVA) model when the error terms have skew- normal distribution. We obtain the estimators of the model parameters by using the maximum likelihood (ML) and the modified maximum ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Slashed Rayleigh Distribution 

      Iriarte, Yuri A.; Gómez, Héctor W.; Varela, Héctor; Bolfarine, Heleno
      In this article we study a subfamily of the slashed-Weibull family. This subfamily can be seen as an extension of the Rayleigh distribution with more flexibility in terms of the kurtosis of distribution. This special ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Optimization of Contribution Margins in Food Services by Modeling Independent Component Demand 

      Rojas, Fernando; Leiva, Víctor; Wanke, Peter; Marchant, Carolina
      We propose a methodology useful for food services, allowing contribution margins to be optimized. This is based on statistical tools, inventory models and financial indicators. To reduce the gap between theory and practice, ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Slashed Exponentiated Rayleigh Distribution 

      Salinas, Hugo S.; Iriarte, Yuri A.; Bolfarine, Heleno
      In this paper we introduce a new distribution for modeling positive data with high kurtosis. This distribution can be seen as an extension of the exponentiated Rayleigh distribution. This extension builds on the quotient of ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Design of SkSP-R Variables Sampling Plans 

      Aslam, Muhammad; Balamurali, Saminathan; Jun, Chi-Hyuck; Hussain, Batool
      In this paper, we present the designing of the skip-lot sampling plan including the re-inspection  called SkSP-R. The plan parameters of the proposed plan are determined through a  nonlinear optimization problem by minimizing ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Bayesian Analysis of the 3-Component Mixture of Exponential Distribution Assuming the Non-Informative Priors 

      Tahir, Muhammad; Aslam, Muhammad
      Bayesian analysis of the 3-component mixture of an Exponential distribution under type-I right censoring scheme is considered in this paper. The Bayes estimators and posterior risks for the unknown parameters are derived ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. 
    • Combining Some Biased Estimation Methods with Least Trimmed Squares Regression and its Application 

      Kan-Kilinç, Betül; Alpu, Ozlem
      In the case of multicollinearity and outliers in regression analysis, the researchers are encouraged to deal with two problems simultaneously. Biased methods based on robust estimators are useful for estimating the ...
      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 

      Aslam, Muhammad; Riaz, Muhammad; Sindhu, Tabassum Naz; Ahmed, Zaheer
      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. 
    • Nonparametric Double EWMA Control Chart for Process Monitoring 

      Riaza, Muhammad; Abbasib, Saddam Akber
      In monitoring process parameters, we assume normality of the quality characteristic of interest, which is an ideal assumption. In many practical situations, we may not know the distributional behavior of the data, and ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística.