Summary of current and next issues

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Next issue articles are papers that have been copy-edited and typeset but not yet paginated for inclusion in an issue of the journal. The final version of articles can be downloaded from the "Current issue" and "Downloadable articles" section.

Next issue: volume 43 (1), January-June 2019

  • A simheuristic for routing electric vehicles with limited driving ranges and stochastic travel times

    Lorena Reyes-Rubiano, Daniele Ferone, Angel A. Juan and Javier Faulin

  • New L2-type exponentiality tests

    Marija Cuparić, Bojana Milosević and Marko Obradović

  • Bayesian joint spatio-temporal analysis of multiple diseases

    Virgilio Gómez-Rubio, Francisco Palmí-Perales, Gonzalo López-Abente, Rebeca Ramis-Prieto and Pablo Fernández-Navarro

  • Internalizing negative externalities in vehicle routing problems through green taxes and green tolls

    Adrián Serrano-Hernández and Javier Faulín

  • A probabilistic model for explaining the points achieved by a team in football competition. Forecasting and regression with applications to the Spanish competition

    Emilio Gómez-Déniz, Nancy Dávila Cárdenes and José María Pérez Sánchez

Current issue: volume 42 (2), July-December 2018

  • Evidence functions: a compositional approach to information (invited article)

    Juan-José Egozcue and Vera Pawlowsky-Glahn

    Abstract: The discrete case of Bayes’ formula is considered the paradigm of information acquisition. Prior and posterior probability functions, as well as likelihood functions, called evidence functions, are compositions following the Aitchison geometry of the simplex, and have thus vector character. Bayes’ formula becomes a vector addition. The Aitchison norm of an evidence function is introduced as a scalar measurement of information. A fictitious fire scenario serves as illustration. Two different inspections of affected houses are considered. Two questions are addressed: (a) which is the information provided by the outcomes of inspections, and (b) which is the most informative inspection.

    Keywords: Evidence function, Bayes’ formula, Aitchison geometry, compositions, orthonormal basis, simplex, scalar information

    Pages: 101–124

    DOI: 10.2436/20.8080.02.71

  • A contingency table approach based on nearest neighbour relations for testing self and mixed correspondence

    Elvan Ceyhan

    Abstract: Nearest 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 specificity and segregation, and define an associated contingency table called a correspondence contingency table, and examine the relation of correspondence with the motivating patterns (namely, segregation and niche specificity). We propose tests based on the correspondence contingency table for testing self and mixed correspondence and determine the appropriate null hypotheses and the underlying conditions appropriate for these tests. We compare finite sample performance of the tests in terms of empirical size and power by extensive Monte Carlo simulations and illustrate the methods on two artificial data sets and one real-life ecological data set.

    Keywords: Association, complete spatial randomness, habitat/niche specificity, independence, random labelling, segregation

    Pages: 125–158

    DOI: 10.2436/20.8080.02.72

  • Efficiency of propensity score adjustment and calibration on the estimation from non-probabilistic online surveys

    Ramón Ferri-García and Maria del Mar Rueda

    Abstract: One of the main sources of inaccuracy in modern survey techniques, such as online and smartphone surveys, is the absence of an adequate sampling frame that could provide a probabilistic sampling. This kind of data collection leads to the presence of high amounts of bias in final estimates of the survey, specially if the estimated variables (also known as target variables) have some influence on the decision of the respondent to participate in the survey. Various correction techniques, such as calibration and propensity score adjustment or PSA, can be applied to remove the bias. This study attempts to analyse the efficiency of correction techniques in multiple situations, applying a combination of propensity score adjustment and calibration on both types of variables (correlated and not correlated with the missing data mechanism) and testing the use of a reference survey to get the population totals for calibration variables. The study was performed using a simulation of a fictitious population of potential voters and a real volunteer survey aimed to a population for which a complete census was available. Results showed that PSA combined with calibration results in a bias removal considerably larger when compared with calibration with no prior adjustment. Results also showed that using population totals from the estimates of a reference survey instead of the available population data does not make a difference in estimates accuracy, although it can contribute to slightly increment the variance of the estimator.

    Keywords: Online surveys, Smartphone surveys, propensity score adjustment, calibration, simulation

    Pages: 159–182

    DOI: 10.2436/20.8080.02.73

  • Field rules and bias in random surveys with quota samples. An assessment of CIS surveys

    José M. Pavía and Cristina Aybar

    Abstract: Surveys applying quota sampling in their final step are widely used in opinion and market research all over the world. This is also the case in Spain, where the surveys carried out by CIS (a public institution for sociological research supported by the government) have become a point of reference. The rules used by CIS to select individuals within quotas, however, could be improved as they lead to biases in age distributions. Analysing more than 545,000 responses collected in the 220 monthly barometers conducted between 1997 and 2016 by CIS, we compare the empirical distributions of the barometers with the expected distributions from the sample design and/or target populations. Among other results, we find, as a consequence of the rules used, significant overrepresentations in the observed proportions of respondents with ages equal to the minimum and maximum of each quota (age and gender group). Furthermore, in line with previous literature, we also note a significant overrepresentation of ages ending in zero. After offering simple solutions to avoid all these biases, we discuss some of their consequences for modelling and inference and about limitations and potentialities of CIS data

    Keywords: Centre for Sociological Research, quota sampling, fieldwork rules, age and gender groups, inter-quota distributions, intra-quota distributions

    Pages: 183–206

    DOI: 10.2436/20.8080.02.74

  • Effect of agro-climatic conditions on near infrared spectra of extra virgin olive oils

    María Isabel Sánchez-Rodríguez, Elena M. Sánchez-López, José Mª Caridad, Alberto Marinas and Francisco José Urbano

    Abstract: Authentication of extra virgin olive oil requires fast and cost-effective analytical procedures, such as near infrared spectroscopy. Multivariate analysis and chemometrics have been successfully applied in several papers to gather qualitative and quantitative information of extra virgin olive oils from near infrared spectra. Moreover, there are many examples in the literature analysing the effect of agro-climatic conditions on food content, in general, and in olive oil components, in particular. But the majority of these studies considered a factor, a non-numerical variable, containing this meteorological information. The present work uses all the agro-climatic data with the aim of highlighting the linear relationships between them and the near infrared spectra. The study begins with a graphical motivation, continues with a bivariate analysis and, finally, applies redundancy analysis to extend and confirm the previous conclusions.

    Keywords: Extra virgin olive oil, infrared spectroscopy, agro-climatic data, linear correlations, redundancy analysis

    Pages: 209–236

    DOI: 10.2436/20.8080.02.75

  • Poisson excess relative risk models: new implementations and software

    Manuel Higueras and Adam Howes

    Abstract: Two new implementations for fitting Poisson excess relative risk methods are proposed for assumed simple models. This allows for estimation of the excess relative risk associated with a unique exposure, where the background risk is modelled by a unique categorical variable, for example gender or attained age levels. Additionally, it is shown how to fit general Poisson linear relative risk models in R. Both simple methods and the R fitting are illustrated in three examples. The first two examples are from the radiation epidemiology literature. Data in the third example are randomly generated with the purpose of sharing it jointly with the R scripts.

    Keywords: Radiation epidemiology, Poisson non-linear regression, improper priors, R programming

    Pages: 237–252

    DOI: 10.2436/20.8080.02.76

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