Reports of Conferences,Institutes, and Seminars

In the span of four weeks, from late March to early April 2008, three important technical services conferences were held: the Electronic Resources & Libraries Conference, the New England Technical Services Librarians Conference, and the North Carolina Serials Conference.     

Bayesian hierarchical regression models for detecting QTLs in plant experiments

Quantitative trait loci (QTL) mapping is a growing field in statistical genetics. In plants, QTL detection experiments often feature replicates or clones within a specific genetic line. In this work, a Bayesian hierarchical regression model is applied to simulated QTL data and to a dataset from the Arabidopsis thaliana plants for locating the QTL mapping associated with cotyledon opening. A conditional model search strategy based on Bayesian model averaging is utilized to reduce the computational burden.     

Semiparametric log-linear regression for longitudinal measurements subject to outcome-dependent follow-up

A common problem for longitudinal data analyses is that subjects follow-up is irregular, often related to the past outcome or other factors associated with the outcome measure that are not included in the regression model. Analyses unadjusted for outcome-dependent follow-up yield biased estimates. We propose a longitudinal data analysis that can provide consistent estimates in regression models that are subject to outcome-dependent follow-up. We focus on semiparametric marginal log-link regression with arbitrary unspecified baseline function. Based on estimating equations, the proposed class of estimators are root n consistent and asymptotically normal. We present simulation studies that assess the performance of the estimators under finite samples. We illustrate our approach using data from a health services research study.     

The utilitarian contract: A generalization of Rawls' theory of justice

In a series of major papers culminating in A Theory of Justice, John Rawls constructs an alternative to utilitarianism by developing a social contract theory of moral and political philosophy. Unfortunately, Rawls formulates the two basic principles upon which the theory rests in such a way as to restrict (unduly) the contract theory's applicability (see Section I). In this paper we present a more general discussion of the theory of justice that avoids the problems of Rawls' formulation and yet retains the important idea of justice as fairness and the contractarian approach (Section II). Later it is argued that this more general theory constitutes a bridge between the pure utilitarian theories and the social contract doctrines (Sections V and VI). The theory's advantages are demonstrated by applying it to a problem discussed by Rawls, intergenerational equity, and comparing the two solutions (Section III). Further comparisons are made and inferences drawn in the concluding three sections.Without implicating them, we would like to thank James M. Buchanan and David Lyons for comments on an earlier draft of this paper.

---

     

Noncrossing structured additive multiple-output Bayesian quantile regression models

Quantile regression models are a powerful tool for studying different points of the conditional distribution of univariate response variables. Their multivariate counterpart extension though is not straightforward, starting with the definition of multivariate quantiles. We propose here a flexible Bayesian quantile regression model when the response variable is multivariate, where we are able to define a structured additive framework for all predictor variables. We build on previous ideas considering a directional approach to define the quantiles of a response variable with multiple outputs, and we define noncrossing quantiles in every directional quantile model. We define a Markov chain Monte Carlo (MCMC) procedure for model estimation, where the noncrossing property is obtained considering a Gaussian process design to model the correlation between several quantile regression models. We illustrate the results of these models using two datasets: one on dimensions of inequality in the population, such as income and health; the second on scores of students in the Brazilian High School National Exam, considering three dimensions for the response variable.     

Correction to: What do we lose when machines take the decisions?

Journal of Management and Governance - In the original publication, the word “lose” has been inadvertently published as “loose”. All occurrences of “loose”...     

Illuminating urban street (u)topias

ABSTRACT

A utopian vision of the city is often bright, well-lit, and conversely darkness and night are more often associated with dystopia. This paper uses an ethnographic study of night-time in a busy street space in the middle of a south coast UK city in order to demonstrate the application of ‘utopia as method’, or rather utopia as a mobile method in understanding justice and injustice in urban space. In doing so, we suggest the possibilities of urban mobile space, arguing that ‘utopia as method’ originates in Lefebvre’s (1991) work on the possibilities that arise from the seemingly impossible imaginings of urban transformation. We use what are considered to be distinct approaches to photography: ‘ethnographic’ and ‘expressive’ in demonstrating this. Photography tells a story of the lighting of the space in illuminating the street in particular ways and making visible aspects that otherwise may go unnoticed. We draw from the boundaries, of photography (and therefore light), of method, and of urban space, looking to the ‘territorial edges’ for Lefebvre’s possibilities.     

Disaster Anniversay: A Social Reconstruction of Time

The author uses a sociology of time framework to explore how six communities acknowledge the first and second anniversary of Hurricane Hugo. Employing the concept anniversary with a conventional time framework, a comparative case study of coastal and inland communities is used to illustrate how past events surrounding a disaster, such as Hurricane Hugo, are reconstructed to have meaning and utility for the present.